1) x/5 = 7/10x = 5 * 7/10x = 3.5
2) 16 - x/9 = 4/27x/9 = 16 - 4/27x/9 = 432/27 - 4/27x/9 = 428/27x = 428/27 * 9x = 428/3x = 142.67
3) 3.2 + 2x = 6.5 * 242x = 156 - 3.22x = 152.8x = 152.8 / 2x = 76.4
4) 4.6 (2.5 + 4x) = 23.464.6 2.5 + 4.6 * 4x = 23.4611.5 + 18.4x = 23.4618.4x = 23.46 - 11.518.4x = 11.96x = 11.96 / 18.4x = 0.65
Итак, решения уравнений:1) x = 3.52) x = 142.673) x = 76.44) x = 0.65
1) x/5 = 7/10
x = 5 * 7/10
x = 3.5
2) 16 - x/9 = 4/27
x/9 = 16 - 4/27
x/9 = 432/27 - 4/27
x/9 = 428/27
x = 428/27 * 9
x = 428/3
x = 142.67
3) 3.2 + 2x = 6.5 * 24
2x = 156 - 3.2
2x = 152.8
x = 152.8 / 2
x = 76.4
4) 4.6 (2.5 + 4x) = 23.46
4.6 2.5 + 4.6 * 4x = 23.46
11.5 + 18.4x = 23.46
18.4x = 23.46 - 11.5
18.4x = 11.96
x = 11.96 / 18.4
x = 0.65
Итак, решения уравнений:
1) x = 3.5
2) x = 142.67
3) x = 76.4
4) x = 0.65