Question

por favor alguem sabe responder por favor me
a)7x-28=3x+12
b)5x/6+7/4=8x/3-5/8
c)-3/4+4/5-5/3
d)(+4/5)÷(12/5)÷(-3/4)=​

Answer 1

Resposta:

Explicação passo a passo:

a) 7x-28 = 3x+12

7x - 3x = 12 + 28

4x = 40

x = 40/4

x = 10

b) 5x/6+7/4 = 8x/3-5/8

(10x+21)/12 = (64x-15)/24

24(10x+21) = 12(64x-15)

240x + 504 = 768x - 180

240x - 768x = -180 - 504

-528x = -684 (-)

x = 684/528

x = 57/44

c) -3/4+4/5-5/3

(mmc entre 3, 4 e 5 = 60)

(-45 + 48 - 100)/60 =

-97/60

d) (+4/5)÷(12/5)÷(-3/4)=​

4/5 : 12/5 = 4/5 * 5/12 = 20/60 = 1/3

1/3 : -3/4 = 1/3 * -4/3 = -4/9

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