Question

Va rooooog dau coroana și 50 puncte
Ex 11 va rog

Answer 1

Răspuns:

a. a/3=7/10

10a=3×7=>a=21:10=>a=2,1

100a=100×2,1=210

b. 2/7=a/15

2×15=7a=>a=30:7=>a=4,28

28a=28×4,28=119,84

c.8x=3×36=>x=108:8=>x=13,5

16x=16×13,5=>x=216

d.x²=4×5=>x²=20

5x²=5×20=100

e. ab=5×0,7=>ab=3,5

10ab=10×3,5=35

f. ab=9×4=>ab=36

(36+8)/40=1,1

g. ab=7×4=>ab=28

3×28+2020=2104

h. xy=3×0,9=2,7

5×2,7+6,5=20