Решите уравнения:
а) 2(5 - 3х) = 6 - 5х
б) 2(1 - х) - 4(2х + 8) = 8х + 28
в) 1/2 + 1/4х = х - 3/4
а) 2(5 - 3х) = 6 - 5х
б) 2(1 - х) - 4(2х + 8) = 8х + 28
в) 1/2 + 1/4х = х - 3/4
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А) 2(5 - 3х) = 6 - 5х10-6х=6-5х
-6х+5х=6-10
-х=-4
х=4
б) 2(1 - х) - 4(2х + 8) = 8х + 28
2-2х-8х-32=8х+28
-30-10х=8х+28
-10х-8х=28+30
-18х=58
х=-58/18=-28/9=-3 1/9
в) 1/2 + 1/4х = х - 3/4
1/4х-х=-3/4-1/2
-3/4х=-3/4-2/4
-3/4х=-5/4 умножим на 4
-3х=-5
х=5/3=1 2/3