Question

解方程7.8×3X=3.6 X÷1.98=0.4 （4.5-X）×0.375=0.75 12X+23X=14 X-0.5？

Answer 1

①7.8×3x=3.6
7.8÷3.6×3x=3.6÷3.6
6x=1
6x÷6=1÷6
x=
1
6

②x÷1.98=0.4
x×1.98÷1.98=0.4×1.98
x=0.792

③（4.5-x）×0.375=0.75
4.5×
3
8 -
3
8 x=
3
4

13.5
8 -
3
8 x=
6
8

3
8 x=
7.5
8

3
8 x×
8
3 =
7.5
8 ×
8
3
x=2.5

④12 x+23 x=14
35x=14
35x÷35=14÷35
x=
2
5

⑤x-0.52x=3.2×0.15
0.48x=0.48
0.48x÷0.48=0.48÷0.48
x=1

⑥12x+25%=10
12x+0.25=10
12x+0.25-0.25=10-0.25
12x=9.75
12x÷12=9.75÷12
x=0.8125,6, 解方程
7.8×3X=3.6 X÷1.98=0.4 （4.5-X）×0.375=0.75 12X+23X=14 X-0.52X=3.2×0.15 12X+25%=10．