Question

Номер три сделайте плиз!

Answer 1

1) 54:x + 11 = 800:40
54:x + 11 = 20
54:x = 9
x = 54:9
x = 6

2) x*5 + 12*9 = 138
x*5 + 108 = 138
x*5 = 30
x = 30:5
x = 6

3) 120 + x*3 = 375
x*3 = 255
x = 255:3
x = 85

4) 600 - 120 + x*6 = 600
x*6 = 120
x = 20

5) 1260 + 2*x = 3000
2*x = 1740
x = 870