THI VIOLYMPIC TON 5 _ VNG 11 (2013-2014)

(tham kho)

TON P S

1/ Tm s t nhin nh nht c 5 ch s khc nhau chia ht cho 2; 5 v 9. 12690

2/ Tng ca hai s t nhin bng 2013. Tm hai s bit gia chng c tt

c 15 s chn.

991; 1022

3/ Mt chic in thoi sau khi c gim gi bn ln th nht 10%; ln th

hai 5% gi ang bn, th c bn vi gi 4275000 ng. Tnh gi bn ca

chic in thoi trc khi gim gi.

5000000

4/ C hai kho thc. Kho th nht cha 48,5 tn; kho th hai cha 35 tn. Hi

cng phi ly ra mi kho bao nhiu tn thc s thc cn li trong kho B

bng 50% s thc cn li trong kho A?

21,5

5/ Tm mt s t nhin bit nu vit thm mt ch s 4 vo bn phi s ta

c s mi hn s phi tm 1786 n v. 198

6/ Cho mt hnh vung bit, nu tng cnh hnh vung thm 20% ta c

hnh vung mi c chu vi bng 96cm. Tnh chu vi hnh vung cho.

80

7/ Hy cho bit c tt c bao nhiu s c 4 ch s chia ht cho c 2 v 5 ? 900

8/ Tm hai s thp phn c thng bng hiu v bng 0,6 0,9; 1,5

9/ Cho 3 s c tng bng 345. Bit 50% s th nht bng 1/3 s th hai v

bng 20% s th ba. Tm s th nht.

69

10/ Mt chic in thoi c gim gi bn hai ln: mi ln 10% gi ang

bn th bn vi gi 1620000 ng. Tnh gi bn ca chic in thoi trc khi

gim gi bn.

2000000

11/ Tnh din tch mt hnh vung bit, nu gim cnh hnh vung i 4cm

th din tch hnh vung gim i 192cm2.

2304

12/ Tm s thp phn b nht c cc ch s khc nhau m tng cc ch s ca

s bng 14.

0,1238

13/ Tm s thp phn b nht c cc ch s khc nhau m tch cc ch s ca

s bng 90.

1,259

14/ Nu tng cnh hnh vung thm 20% th din tch hnh vung tng

thm 176cm2. Tnh din tch hnh vung .

400

15/ Cho mt php chia, bit nu ly s b chia chia cho 2 ln s chia th bng

2,4 cn nu ly s b chia chia cho 3 ln thng th bng 2,5. Tm s b chia

ca php chia.

36

16/ Tm trung bnh cng ca tt c cc s t nhin c 3 ch s. 549,5

17/ Mt ca hng nhp vo mi hp bnh l 70000 ng. Hi ca hng phi

bn hp bnh ra vi gi bao nhiu c li 20% gi bn mi hp bnh?

87500

18/ Cho mt s t nhin c 3 ch s. Bit 3 ch s hng trm; hng chc;

hng n v ca s l 3 s t nhin lin tip tng dn. Hi s tng thm

bao nhiu n v nu ta vit s theo th t ngc li.

198

19/ Hy cho bit c tt c bao nhiu s thp phn c 2 ch s phn thp

phn ln hn 2013,5 v nh hn 2014,5 .

99

20/ Tng ca mt s thp phn v mt s t nhin bng 1079,69. Nu b du

phy ca s thp phn i th tng s bng 4514. Tm s thp phn .

34,69

21/ Cho hai s t nhin c trung bnh cng ca hai s t nhin bng 1485 v

bit nu vit thm ch s 1 vo bn tri s b ta c s ln. Tm s b.

985

22/ Cho mt hnh vung c chu vi bng 144cm. Tng cnh hnh vung

thm 25% ta c hnh vung mi. Tm chu vi hnh vung mi.

180

23/ Trong mt php chia 2 s t nhin, bit s b chia l 2374; thng bng

18 v c s d l s d ln nht c th c. Tm s chia ca php chia .

125

24/ Lp 5A c mt s hc sinh, hc k mt c 50% s bn xp hc lc loi

A; 40% s bn xp hc lc loi B. Tnh tng s hc sinh ca lp 5A bit, s

hc sinh xp hc lc loi A nhiu hn loi B l 4 bn.

40

25/ Cho mt hnh vung, bit nu gim cnh hnh vung i 10% th din

tch gim i 118,75cm2 . Tm din tch hnh vung cho.

625

26/ Cho s thp phn A. Chuyn du phy ca s A sang phi 1 hng ta c

s B; Sang tri 1 hng ta c s C. Bit B C = 244,332. Tm s A.

24,68

27/ Hiu ca 2 s bng 9,5. Tm s ln bit, 30% s ln th bng 40% s b. 38

28/ Tng ca hai s bng 28,1; s ln hn s b 9,1 n v. Hi cng phi bt

mi s i bao nhiu n v s ln gp i s b?

0,4

29/ Tm mt s t nhin bit nu xa 2 ch s tn cng ca s i ta c

s mi km s phi tm 1993 n v.

2013

30/ Cho 3 s c tng bng 465. Bit nu em s th nht nhn vi 2 ; s th

hai nhn vi 3 v s th ba nhn vi 5 ta c 3 tch bng nhau. Tm s th

hai l

150

31/ Tm mt s t nhin bit, nu xa ch s 5 hng n v ca n i ta

c s mi; tng ca s mi v s phi tm bng 2216.

2015

32/ Php chia 41,678 : 3,45 nu ly thng c 2 ch s phn thp phn th

s d l bao nhiu?

0,002

33/ Tnh tng tt c cc s t nhin chia ht cho 5 nh hn 2014. 405015

34/ Tm mt s t nhin c 2 ch s, bit s bng 9 ln tng 2 ch s ca

s .

81

35/ Tm mt s t nhin bit, nu xo ch s hng n v ca n i ta c s

mi km s phi tm 1796.

1995

36/ Tnh chu vi hnh trn bit din tch hnh trn bng 7,065m2. 9,42

37/ Cho hai s, bit s b bng 40% tng hai s. Tm t s phn trm gia s

ln v s b.

150

38/ Hin nay tng s tui ca hai m con bng 48 tui. Bit 3 nm trc tui

m gp 5 ln tui con. Tnh tui hai m con hin nay.

10; 38

39/ hon thnh mt cng vic trong 15 ngy th cn 40 ngi lm. Hi

hon thnh cng vic trong 10 ngy th cn bao nhiu ngi lm? (Mc

lm ca mi ngi nh nahu)

60

40/ Cho 3 s A; B; C bit A + B = 353; A + C = 295; B + C = 252. Tnh A -

B.

43