Question

Решите уравнение 4х-2,6х=42 ... 3,9х+4,2х=0,81

Answer 1

(4x-2.6x)=42
1.4x=42
x=42:1.4
x=30

(3.9x+4.2x)=0.81
8.1x=0.81
x=0.81:8.1
x=0.1