Question

Rezolvă exercitiile:
a) [(x+15)×10-100]÷5+90=100
b) 104÷[(x-3×8)×2÷8]=13

Answer 1

A) [(x+15)x10-100]=(100-90)x5
(x+15)x10=50+100
X+15=150:10
X=15-15
X=0
Verificare [(0+15)x10-100]:5+90=100
(150-100):5+90=100
50:5+90=100
10+90=100
100=100
B)104:(x-3x8)x2:8=13
104:13=(x-24)x2:8
8x8=(x-24)x2
X-24=64:2
X=32+24
X=56
Verificare 104:[(56-3x8)x2:8]=13
104:[(56-24)x2:8]=13
104:(32x2:8)=13
104:(64:8)=13
104:8=13
13=13