Question

Найдите корень уравнения :
1) -0,4(3х-1)+8(0,8х-0,3)=5-(3,8х+4)
2) 4/7(0,56-4,2y)+ 0,4 =5/13(0,52-6,5y)

Answer 1

-0,4(3х-1)+8(0,8х-0,3)=5-(3,8х+4)
-1.2x +0.4 + 6.4x - 2.4 = 5-3.8x - 4
5.2x - 2 = 1 - 3.8x
9x = 3
x = 1/3

2) 4/7(0,56-4,2y)+ 0,4 =5/13(0,52-6,5y)
0.32 - 2.4y + 0.4 = 0.2 - 2.5y
0.72 - 2.4y = 0.2 - 2.5y
0.1y = -0.52
y = -5.2