Question

Resolva estas equações: a) 16 + 8 . = 3 . + 81 b) 5 . = 12 . + 49 c) 20 − 8 . = −19 − 21 . �

Answer 1

Resposta:

A 16+8×=3×+81 B 5x=12×+49

8×-3×=81-16 5×-12×=49

5×=65 -7×=49

×=65÷5 x=49÷7

×=13 x= -7

C 20 - 8×= - 19 - 21x

-8×+21×= -20 -19

13x = -39

x= -39 ÷ 13

x= 3