Question

Determină nr.x ștind că: a) (x+1)×7=56. b) (5-x)×8=32. c) (4+x)×5=20

Answer 1

Răspuns:

a)7x+7=56/-7

7x=49:7

x=7

b)40-8x=32/-40

-8x=-8/:(-8)

x=1

c)20+5x=20/-20

5x=0/:5

x=0

Answer 2

Răspuns:

b) (5-x)×8=32=>40-8x=32=>-8x=32-40=>-8x=-8=>x=-8÷(-8)=>x=1

a) (x+1)×7=56=>7x+7=56=>7x=56-7=>7x=48=>x=49÷7=>x=7

c) (4+x)×5=20=>20+5x=20=>5x=20-20=>5x=0=>x=5÷0=>x=0