Уровнения 1. 28x-x=0.729 2. 3.6y +2.8y=22.4

Question

Уровнения


1. 28x-x=0.729


2. 3.6y +2.8y=22.4

Answer 1

1) 28х-х=0.729
27х=0.729
х=0.729:27
х=0.027

2) 3.6у+2.8у=22.4
6.4у=22.4
у=22.4:6.4
у=3.5