Question

Решите уравнение 1) 2х+1/8.1=2/1.8 2)3х-1/3.5=2.8/0.7 3)1.4/2х-1=2,1/7,5
Срочно даю 35 баллов

Answer 1

1) $\frac{2x+1}{8.1} = \frac{2}{1.8}$

1.8(2x+1)= 2*8.1

3.6x+1.8=16.2

3.6x=14.4

x=4

2) $\frac{3x-1}{3.5} = \frac{2.8}{0.7}$

0.7(3x-1)=2.8*3.5

2.1x-0.7=9.8

2.1x=9.8+0.7

2.1x=10.5

x=5

3) $\frac{1.4}{2x-1} = \frac{2.1}{7.5}$

2.1(2x-1)=7.5*1.4

4.2x-2.1=10.5

4.2x=10.5+2.1

4.2x=12.6

x=3