Решите уравнения: а)2*(5х-4)-3*(10х-3)=100 б)-4*(0,5х-2)-3*(0,4х-3)=90 в)-3*(0,6х-0,8х-х)=0 г) -5*(1/3х-1/25х-1/50х)=1/50 д)0,5*(0,4х-0,5)-0,3*(0,2х-0,4)=40

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а) 2(5x-4)-3(10x-3) = 100
10x - 8 - 30x + 9 = 100
-20x + 1 = 100
-20x = 99
x = -99/20

б) -4(0.5x-2) - 3(0.4x-3) = 90
-2x + 8 - 1.2x + 9 = 90
-3.2x + 17 = 90
-3.2x = 73
x = -73/3.2

в) -3(0.6x-0.8x-x) = 0
-3(-0.2x) = 0
0.6x = 0
x = 0

г) -5(1/3x-1/25x-1/50x) = 1/50
-5(25/75x-3/75x-1/75x) = 1/50
-5*(21/75x) = 1/50
-105/75x = 1/50
-7/5x = 1/50
x = -5/350 = -1/70

д) 0.5(0.4x-0.5) - 0.3(0.2x-0.4) = 40
0.2x - 0.25 - 0.06x + 0.12 = 40
0.14x - 0.13 = 40
0.14x = 40.13
x ≈ 286.64

Ответ:
а) x = -99/20
б) x = -73/3.2
в) x = 0
г) x = -1/70
д) x ≈ 286.64