Question

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Answer 1

Răspuns:

25. a)

$\frac{294}{77}$

b)

$\frac{455}{525}$

c)

$\frac{105}{168}$

d)

$\frac{700}{847}$

26. a)

$\frac{25}{8}$

b)

$\frac{13}{15}$

c)

$\frac{25}{6}$

d)

$\frac{114}{24}$

27.a)

$\frac{31}{10}$

b)

$\frac{28}{41}$

c)

$\frac{3}{8}$

d)

$\frac{19}{5}$

28.

3×2=6

7×1=7

3×5=15

4×2=8

2×1=2

3×1=3

5×1=5

11×1=11

13×1=13

7×3=21

17×1=17

29.

2, 3, 5, 7, 11, 13, 17, 19, 23, 29

30.

2×3=6

${2}^{2} \times 3 = 12$

${2}^{2} \times 5 = 20$

2×3×5=30

$2 \times {5}^{2} = 50$

$3 \times {5}^{2} = 75$

7×11=77

${2}^{4} \times 5 = 80$

$2 \times {3}^{2} \times 5 = 90$

${2}^{2} \times {5}^{2} = 100$

${2}^{3} \times 3 \times 5 = 120$

31.

a)6

b)20

c)70

32.

a) aducem la acelasi numitor unde este cazul

b)inmultim numaratorii intre ei si numitorii intre ei se se fac simplificari acolo unde este cazul

c) se ridica si numitorul si numaratorul la puterea data

d)mai intai inmultirea si impartirea apoi adunarea si scaderea

33.x=49

x=4

X=124

x=5

34.

2,11,67

35.

${2}^{3} \times 3 = 24$

${2}^{3} \times 7 = 56$

${2}^{4} \times {3}^{2} = 144$

${2}^{5} \times {3}^{2} = 288$

${2}^{3} \times 3 \times 5 = 120$

${2}^{2} \times 3 \times {5}^{2} = 300$

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