数学高手进来(会解方程)

62.5-x=38.7
62.5-38.7=x
x=23.8

8x-22.8=1.2
8x=22.8+1.2
8x=24
x=3

16x-5x=14.3
11x=14.3
x=1.3

350/x=840/12
350/x=70
70x=350
x=5

x=62.5-38.7=23.8
8x=22.8+1.2=24 x=24/8=3
11x=14.3 x=14.3/11=1.3
840x=350*12 x=5

1. 62.5-x=38.7
x=62.5-38.7
x=23.8

2. 8x-22.8=1.2
8x=22.8+1.2
8x=24
x=3

3. 16x-5x=14.3
11x=14.3
x=1.3

4. 350/x=840/12
350/x=70
x=350/70
x=5
够详细了吧