Question

Решите уравнения:
1) (820-100)/(4х-2)-33=7
2) 35×4-60÷(5x+2)=135
3) 2500÷20+6×(x÷3-9)=155
4) (35-31)×(x÷2-11)+13=26

Answer 1

1)720/(4x-2)=40
4x-2=720:40
4x-2=18
4x=20
x=5
2)140-60:(5x+2)=135
60:(5x+2)=5
(5x+2)=12
5x=10
x=2
3)125+6(x:3-9)=155
6(x:3-9)=30
x:3-9=5
x:3=14
x=42
4)4*(x:2-11)=13
x:2-11=3.25
x:2=14,25
X=28,5