Question

me ajudem pleaseeee é urgente​

Answer 1

Resposta:

1) 8

2)3/4

3)x=28 y=12

4)ab=15 cd = 25

Explicação passo-a-passo:

1)ab/bc = 2/5

ab/20 = 2/5

20÷5 =4

4×2 =8

2) 3/4

3) y/x =3/7

y=3/7 × x

x-y=16

x-3/7×x=16 (7/7-3/7 = 4/7)

4/7x=16

x=16÷4/7

x=28

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bc + y=28

16+y =28

y=12

4)

ab/cd = ef/gh

ab = 40-cd

40-cd/cd=3/5

40-cd=3/5cd

-cd-3/5cd=-40

-1,6cd=-40

cd= 25

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ab+25=40

ab=15