题目内容
解方程：
40%x+1.2=4.8；
4x÷5=
；
20%x-
x=
．
40%x+1.2=4.8；
4x÷5=
| 8 |
| 15 |
20%x-
| 3 |
| 20 |
| 2 |
| 5 |
①40%x+1.2=4.8
0.4x+1.2-1.2=4.8-1.2
0.4x=3.6
x=9
②4x÷5=
4x×
=
4x×
×5=
×5
4x=
4x×
=
×
x=
③20%x-
x=
0.2x-0.15x=0.4
0.05x=0.4
0.05x÷0.05=0.4÷0.05
x=8
0.4x+1.2-1.2=4.8-1.2
0.4x=3.6
x=9
②4x÷5=
| 8 |
| 15 |
4x×
| 1 |
| 5 |
| 8 |
| 15 |
4x×
| 1 |
| 5 |
| 8 |
| 15 |
4x=
| 8 |
| 3 |
4x×
| 1 |
| 4 |
| 8 |
| 3 |
| 1 |
| 4 |
x=
| 2 |
| 3 |
③20%x-
| 3 |
| 20 |
| 2 |
| 5 |
0.2x-0.15x=0.4
0.05x=0.4
0.05x÷0.05=0.4÷0.05
x=8
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