Question

1)resolva as seguintes expressões numéricas.

A) {-7+[5×3+(7×7)-8]+18÷3}

B) 3×+5=26

C)-4-5-7+12-3×3+5×8-7+90

D)-35-45+90-30+20-(-5)+7×8+25÷5

E)7×+12=5×+18

Answer 1

Resposta:

B) 3x+5=26

3x=26-5

3x=21

x= 21:3

x= 7

C) -4-5-7+12-3x3+5x8-7+90

-4-5-7+12-9+40-7+90

= 16+12-9+40-7+90

=38-9+40-7+90

=31+40-7+90

=71-7+90

=64+90

=154

E) 7x+12=5x+18

7x-5x= 18-12

2x= 6

x=6:2

x=3