Question

a.(x+5)×10-100:5+90=100
b.[(x+15)×10-1000):5+90=100
*metoda mersului invers
ajutor​

Answer 1

1.(x+5)×10-100:5+90=100

10x+50-20+90=100

10x+50-20=100-90

10x+50-20=10

10x+50=30

10x=30-50

10x=-20

x=-20:10

x=-2

2. [(x+15)×10-1000):5+90=100

(10x+150-1000):5=10

10x+150-1000=50

10x+150=50+1000

10x+150=1050

10x=1050-150

10x=900

x=900:10<=>x=90