Question

ajutor la ex 3 va rog​

Answer 1

Răspuns:

Explicație pas cu pas:

 

Answer 2

Răspuns:

a.125/100×32=125×32:100=40

raspuns 3

b.(x+1)/6=6/9

9(x+1)=6×6

9x+9=36

9x=36-9=>x=27:9=>x=3

raspuns 5

c. mapa=120g

md=30g

ms=120g+30g=150g

C=(md×100)/ms=100×30:150=20%

raspuns 2

d. x/21=10/y=5/7

10/y=5/7=>5y=10×7=>y=70:5=>y=14

x/21=5/7=>7x=21×5=>x=105:7=>x=15

x+y=14+15=>x+y=29

raspuns 4