Question

mim ajudem resolver esta questão
a ) 20+90=7×+30
b ) 9x+30-10=4x-90
c ) 90-30=70+25-x

Answer 1

Mim ajudem resolver esta questãoa ) 20+90=7×+30

20 + 90 = 7x + 30
110 = 7x + 30

110  - 7x = 30
- 7x = 30 - 110
- 7x = - 80
x = - 80/-7
x = + 80/7

 

b ) 9x+30-10=4x-90

9x + 30 - 10 = 4x - 90
9x + 20 = 4x - 90
9x + 20 - 4x = - 90
9x - 4x = -90 - 20
5x = - 110
x = - 110/5
x  = - 22


c ) 90-30=70+25-x

90 - 30 = 70 + 25 - x
       60 = 95 - x
60 - 95 = - x
- 35 = - x

- x = - 35
x = (-)(-)35
x = + 35