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O iii — 4ac O iv b - 4ac O bc — 2ab 2bc — 4ab 4a2— 2bc — 4ab 4a2 — cz 2bc — 4ab loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader031vdocumentspubreader031viewer20220118155e69114908e88049951265f7html5thumbnails2jpg width=140 height=200 divphttp:teachingbdcomp pTeachp pingbdcop pmp div class=annotationa href=http:teachingbdcom rel=ugc nofollow target=_blankhttp:teachingbdcomadiv div class=annotationa href=http:teachingbdcom rel=ugc nofollow target=_blankhttp:teachingbdcomadivdivdiv class=ts-pagebutton class=gotoPage data-page=3Page 3button div class=ts-imageimg data-url=teachingbd-bl-a-3abc-2a-fx-o-b2-a-4ac-i-ii-o-iii-a-4ac-ohtmlpage=3 data-page=3 class=ts-thumb lazyload alt=Page 3: Teachingbd · bl — 3abc 2a + fx O b2 — 4ac i ii - O iii — 4ac O iv b - 4ac O bc — 2ab 2bc — 4ab 4a2— 2bc — 4ab 4a2 — cz 2bc — 4ab loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader031vdocumentspubreader031viewer20220118155e69114908e88049951265f7html5thumbnails3jpg width=140 height=200 divphttp:teachingbdcomp pTeachp pingbdcop pmp div class=annotationa href=http:teachingbdcom rel=ugc nofollow target=_blankhttp:teachingbdcomadiv div class=annotationa href=http:teachingbdcom rel=ugc nofollow target=_blankhttp:teachingbdcomadivdivdiv class=ts-pagebutton class=gotoPage data-page=4Page 4button div class=ts-imageimg data-url=teachingbd-bl-a-3abc-2a-fx-o-b2-a-4ac-i-ii-o-iii-a-4ac-ohtmlpage=4 data-page=4 class=ts-thumb lazyload alt=Page 4: Teachingbd · bl — 3abc 2a + fx O b2 — 4ac i ii - O iii — 4ac O iv b - 4ac O bc — 2ab 2bc — 4ab 4a2— 2bc — 4ab 4a2 — cz 2bc — 4ab loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader031vdocumentspubreader031viewer20220118155e69114908e88049951265f7html5thumbnails4jpg width=140 height=200 divphttp:teachingbdcomp pTeachp pingbdcop pmp div class=annotationa href=http:teachingbdcom rel=ugc nofollow target=_blankhttp:teachingbdcomadiv div class=annotationa href=http:teachingbdcom rel=ugc nofollow target=_blankhttp:teachingbdcomadivdivdiv class=ts-pagebutton class=gotoPage data-page=5Page 5button div class=ts-imageimg data-url=teachingbd-bl-a-3abc-2a-fx-o-b2-a-4ac-i-ii-o-iii-a-4ac-ohtmlpage=5 data-page=5 class=ts-thumb lazyload alt=Page 5: Teachingbd · bl — 3abc 2a + fx O b2 — 4ac i ii - O iii — 4ac O iv b - 4ac O bc — 2ab 2bc — 4ab 4a2— 2bc — 4ab 4a2 — cz 2bc — 4ab loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader031vdocumentspubreader031viewer20220118155e69114908e88049951265f7html5thumbnails5jpg width=140 height=200 divphttp:teachingbdcomp pTeachp pingbdcop pmp div class=annotationa href=http:teachingbdcom rel=ugc nofollow target=_blankhttp:teachingbdcomadiv div class=annotationa href=http:teachingbdcom rel=ugc nofollow target=_blankhttp:teachingbdcomadivdivdiv class=ts-pagebutton class=gotoPage data-page=6Page 6button div class=ts-imageimg data-url=teachingbd-bl-a-3abc-2a-fx-o-b2-a-4ac-i-ii-o-iii-a-4ac-ohtmlpage=6 data-page=6 class=ts-thumb lazyload alt=Page 6: Teachingbd · bl — 3abc 2a + fx O b2 — 4ac i ii - O iii — 4ac O iv b - 4ac O bc — 2ab 2bc — 4ab 4a2— 2bc — 4ab 4a2 — cz 2bc — 4ab loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader031vdocumentspubreader031viewer20220118155e69114908e88049951265f7html5thumbnails6jpg width=140 height=200 divphttp:teachingbdcomp pTeachp pingbdcop pmp div class=annotationa href=http:teachingbdcom rel=ugc nofollow target=_blankhttp:teachingbdcomadiv div class=annotationa href=http:teachingbdcom rel=ugc nofollow target=_blankhttp:teachingbdcomadivdivdiv class=ts-pagebutton class=gotoPage data-page=7Page 7button div class=ts-imageimg data-url=teachingbd-bl-a-3abc-2a-fx-o-b2-a-4ac-i-ii-o-iii-a-4ac-ohtmlpage=7 data-page=7 class=ts-thumb lazyload alt=Page 7: Teachingbd · bl — 3abc 2a + fx O b2 — 4ac i ii - O iii — 4ac O iv b - 4ac O bc — 2ab 2bc — 4ab 4a2— 2bc — 4ab 4a2 — cz 2bc — 4ab loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader031vdocumentspubreader031viewer20220118155e69114908e88049951265f7html5thumbnails7jpg width=140 height=200 divphttp:teachingbdcomp pTeachp pingbdcop pmp div class=annotationa href=http:teachingbdcom rel=ugc nofollow target=_blankhttp:teachingbdcomadiv div class=annotationa href=http:teachingbdcom rel=ugc nofollow target=_blankhttp:teachingbdcomadivdivdiv class=ts-pagebutton class=gotoPage data-page=8Page 8button div class=ts-imageimg data-url=teachingbd-bl-a-3abc-2a-fx-o-b2-a-4ac-i-ii-o-iii-a-4ac-ohtmlpage=8 data-page=8 class=ts-thumb lazyload alt=Page 8: Teachingbd · bl — 3abc 2a + fx O b2 — 4ac i ii - O iii — 4ac O iv b - 4ac O bc — 2ab 2bc — 4ab 4a2— 2bc — 4ab 4a2 — cz 2bc — 4ab loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader031vdocumentspubreader031viewer20220118155e69114908e88049951265f7html5thumbnails8jpg width=140 height=200 divphttp:teachingbdcomp pTeachp pingbdcop pmp div class=annotationa href=http:teachingbdcom rel=ugc nofollow target=_blankhttp:teachingbdcomadiv div class=annotationa href=http:teachingbdcom rel=ugc nofollow target=_blankhttp:teachingbdcomadivdivdiv class=ts-pagebutton class=gotoPage data-page=9Page 9button div class=ts-imageimg data-url=teachingbd-bl-a-3abc-2a-fx-o-b2-a-4ac-i-ii-o-iii-a-4ac-ohtmlpage=9 data-page=9 class=ts-thumb lazyload alt=Page 9: Teachingbd · bl — 3abc 2a + fx O b2 — 4ac i ii - O iii — 4ac O iv b - 4ac O bc — 2ab 2bc — 4ab 4a2— 2bc — 4ab 4a2 — cz 2bc — 4ab loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader031vdocumentspubreader031viewer20220118155e69114908e88049951265f7html5thumbnails9jpg width=140 height=200 divphttp:teachingbdcomp pTeachp pingbdcop pmp div class=annotationa href=http:teachingbdcom rel=ugc nofollow target=_blankhttp:teachingbdcomadiv div class=annotationa href=http:teachingbdcom rel=ugc nofollow target=_blankhttp:teachingbdcomadivdivdiv class=ts-pagebutton class=gotoPage data-page=10Page 10button div class=ts-imageimg data-url=teachingbd-bl-a-3abc-2a-fx-o-b2-a-4ac-i-ii-o-iii-a-4ac-ohtmlpage=10 data-page=10 class=ts-thumb lazyload alt=Page 10: Teachingbd · bl — 3abc 2a + fx O b2 — 4ac i ii - O iii — 4ac O iv b - 4ac O bc — 2ab 2bc — 4ab 4a2— 2bc — 4ab 4a2 — cz 2bc — 4ab loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader031vdocumentspubreader031viewer20220118155e69114908e88049951265f7html5thumbnails10jpg width=140 height=200 divphttp:teachingbdcomp pTeachp pingbdcop pmp div class=annotationa href=http:teachingbdcom rel=ugc nofollow target=_blankhttp:teachingbdcomadiv div class=annotationa href=http:teachingbdcom rel=ugc nofollow target=_blankhttp:teachingbdcomadivdivdiv class=ts-pagebutton class=gotoPage data-page=11Page 11button div class=ts-imageimg data-url=teachingbd-bl-a-3abc-2a-fx-o-b2-a-4ac-i-ii-o-iii-a-4ac-ohtmlpage=11 data-page=11 class=ts-thumb lazyload alt=Page 11: Teachingbd · bl — 3abc 2a + fx O b2 — 4ac i ii - O iii — 4ac O iv b - 4ac O bc — 2ab 2bc — 4ab 4a2— 2bc — 4ab 4a2 — cz 2bc — 4ab loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader031vdocumentspubreader031viewer20220118155e69114908e88049951265f7html5thumbnails11jpg width=140 height=200 divphttp:teachingbdcomp pTeachp pingbdcop pmp div class=annotationa href=http:teachingbdcom rel=ugc nofollow target=_blankhttp:teachingbdcomadiv div class=annotationa href=http:teachingbdcom rel=ugc nofollow target=_blankhttp:teachingbdcomadivdivdiv class=ts-pagebutton class=gotoPage data-page=12Page 12button div class=ts-imageimg data-url=teachingbd-bl-a-3abc-2a-fx-o-b2-a-4ac-i-ii-o-iii-a-4ac-ohtmlpage=12 data-page=12 class=ts-thumb lazyload alt=Page 12: Teachingbd · bl — 3abc 2a + fx O b2 — 4ac i ii - O iii — 4ac O iv b - 4ac O bc — 2ab 2bc — 4ab 4a2— 2bc — 4ab 4a2 — cz 2bc — 4ab loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader031vdocumentspubreader031viewer20220118155e69114908e88049951265f7html5thumbnails12jpg width=140 height=200 divphttp:teachingbdcomp pTeachp pingbdcop pmp div class=annotationa href=http:teachingbdcom rel=ugc nofollow target=_blankhttp:teachingbdcomadiv div class=annotationa href=http:teachingbdcom rel=ugc nofollow target=_blankhttp:teachingbdcomadivdivdiv class=ts-pagebutton class=gotoPage data-page=13Page 13button div class=ts-imageimg data-url=teachingbd-bl-a-3abc-2a-fx-o-b2-a-4ac-i-ii-o-iii-a-4ac-ohtmlpage=13 data-page=13 class=ts-thumb lazyload alt=Page 13: Teachingbd · bl — 3abc 2a + fx O b2 — 4ac i ii - O iii — 4ac O iv b - 4ac O bc — 2ab 2bc — 4ab 4a2— 2bc — 4ab 4a2 — cz 2bc — 4ab loading=lazy src=data:imagegifbase64iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAQAAADYv8WvAAAAD0lEQVR42mP8X8AwAgiABKBAv+vAXklAAAAAElFTkSuQmCC data-src=https:reader031vdocumentspubreader031viewer20220118155e69114908e88049951265f7html5thumbnails13jpg width=140 height=200 divphttp:teachingbdcomp pTeachp pingbdcop pmp div class=annotationa href=http:teachingbdcom rel=ugc nofollow target=_blankhttp:teachingbdcomadiv div class=annotationa href=http:teachingbdcom rel=ugc nofollow target=_blankhttp:teachingbdcomadivdivdiv class=ts-pagebutton class=gotoPage data-page=14Page 14button div class=ts-imageimg data-url=teachingbd-bl-a-3abc-2a-fx-o-b2-a-4ac-i-ii-o-iii-a-4ac-ohtmlpage=14 data-page=14 class=ts-thumb lazyload alt=Page 14: Teachingbd · bl — 3abc 2a + fx O b2 — 4ac i ii - 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