Question

A) 7×+9=78-15×

B) 81×-7=28×-17

C) 2.(7×-5)=2.(8×+3)+9

Por favor me ajudem!!!

Answer 1

Resposta:

A) 7×+9=78-15×

7×+15×=78-9

+22×=69

×= 69

22

B)81×-7=28×-17

81×-28×=-17+7

53×= -10

×= -10

53

C)2.(7×-5)=2.(8×+3)+9

14×-10=16×+6+9

14×-16×=+6+9+10

-2×=25

×= 25

2