题目内容
解方程
0-21×
=4&nb个p;&nb个p;&nb个p;&nb个p;&nb个p;&nb个p;&nb个p;&nb个p;&nb个p;&nb个p;&nb个p;&nb个p;&nb个p;&nb个p;&nb个p;&nb个p;&nb个p;&nb个p;
&nb个p;
:0=4:160.
| 3 |
| 10 |
| 2 |
| 3 |
&nb个p;
| 4 |
| 4 |
(1)
X-31×
=m,
X-1m=m,
X-1m+1m=m+1m,
X=18,
X×
=18×
,
X=60;
(3)
:X=5:160,
5X=
×160,
5X÷5=100÷5,
X=30.
| 3 |
| 10 |
| 3 |
| 3 |
| 3 |
| 10 |
| 3 |
| 10 |
| 3 |
| 10 |
| 3 |
| 10 |
| 10 |
| 3 |
| 10 |
| 3 |
X=60;
(3)
| 5 |
| 8 |
5X=
| 5 |
| 8 |
5X÷5=100÷5,
X=30.
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