Решить уравнения. а) 2 (5 - 3х) = 6 - 5х ; б) 2 (1 - х) -4 (2х + 8) = 8х + 28 ; в)1/2 +...

Question

Решить уравнения.
а) 2 (5 - 3х) = 6 - 5х ;
б) 2 (1 - х) -4 (2х + 8) = 8х + 28 ;
в)1/2 + 1/4х=х - 3/4

Answer 1

2(5-3х)=6-5х
10-6х=6-5х
-6х+5х=6-10
-х=-4
х=4
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2(1-х)-4(2х+8)=8х+28
2-2х-8х-32=8х+28
-10х-8х=28-2+32
-18х=58
х=58 / (-18)
х=3  2/9
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1/2+1/4х=х-3/4
1/4х-х=-3/4 - 1/2
-3/4х=-5/4
х=-5/4 / (-3/4)
х=5/3
х=1  2/3