а)-7 + 3y = 8 - 8*(2 - y)-7 + 3y = 8 - 16 + 8y-7 + 3y = -8 + 8y3y - 8y = -8 + 7-5y = -1y = 1/5
б)-5(2 - 2x) = 2(x - 3) + 4-10 + 10x = 2x - 6 + 410x - 2x = -12 + 108x = -2x = -1/4
в)2x - 4(x + 7) = 3(2 - x)2x - 4x - 28 = 6 - 3x-2x - 28 = 6 - 3x2x + 3x = 6 + 285x = 34x = 34/5
2)a)1.26x + 3.58 = 1.74x + 6.461.26x - 1.74x = 6.46 - 3.58-0.48x = 2.88x = -2.88 / -0.48x = 6
б)0.88 - (5.12 + 0.08y) = 4.92y - y0.88 - 5.12 - 0.08y = 4.92y - y-4.24 - 0.08y = 3.92y - 1y-4.24 + y = 3.92yy + 3.92y = 4.244.92y = 4.24y = 4.24 / 4.92y ≈ 0.86
а)
-7 + 3y = 8 - 8*(2 - y)
-7 + 3y = 8 - 16 + 8y
-7 + 3y = -8 + 8y
3y - 8y = -8 + 7
-5y = -1
y = 1/5
б)
-5(2 - 2x) = 2(x - 3) + 4
-10 + 10x = 2x - 6 + 4
10x - 2x = -12 + 10
8x = -2
x = -1/4
в)
2x - 4(x + 7) = 3(2 - x)
2x - 4x - 28 = 6 - 3x
-2x - 28 = 6 - 3x
2x + 3x = 6 + 28
5x = 34
x = 34/5
2)
a)
1.26x + 3.58 = 1.74x + 6.46
1.26x - 1.74x = 6.46 - 3.58
-0.48x = 2.88
x = -2.88 / -0.48
x = 6
б)
0.88 - (5.12 + 0.08y) = 4.92y - y
0.88 - 5.12 - 0.08y = 4.92y - y
-4.24 - 0.08y = 3.92y - 1y
-4.24 + y = 3.92y
y + 3.92y = 4.24
4.92y = 4.24
y = 4.24 / 4.92
y ≈ 0.86