Question

列方程解文字题（要详细过程）1.一个数的5倍比它的3倍多12.8,求这个数.2.一个数的5倍减去15与0.6的积,差是5

Answer 1

设这个数是x.

1.5x - 3x = 12.8

2x = 12.8

x = 6.4

2.5x - 15 * 0.6 = 56

5x - 9 = 56

5x = 65

x = 13

3.60% x = 35 * 3/7

x = 15/0.6

x = 25

4.15 - 50% x = 3.4

30 - x = 6.8

x = 23.2

5.x/3 = 760/4

x = 570

6.48% x = 18 * 1/3 + 2

x = 8 / 0.48

x = 50/3

7.9 * 2/3 - 3/4 * x = 3

6 - 3/4 * x = 3

3/4 * x = 3

x = 4