解方程7.8×3X=3.6 X÷1.98=0.4 &nb...
解方程7.8×3X=3.6X÷1.98=0.4（4.5-X）×0.375=0.7512X+23X=14X-0.52X=3.2×0.1512X+25%=10．...
解方程7.8×3X=3.6 X÷1.98=0.4 （4.5-X）×0.375=0.75 12 X+23 X=14 X-0.52 X=3.2×0.15 12 X+25%=10．
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①7.8×3x=3.6
7.8÷3.6×3x=3.6÷3.6
6x=1
6x÷6=1÷6
x=
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×
-
x=
?
x=
x=
x×
=
×
x=2.5
④12 x+23 x=14
35x=14
35x÷35=14÷35
x=
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
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 |
| 3 |
| 4 |
| 13.5 |
| 8 |
| 3 |
| 8 |
| 6 |
| 8 |
| 3 |
| 8 |
| 7.5 |
| 8 |
| 3 |
| 8 |
| 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
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