题目内容
解方程:
4X-
=
=60%
X-(
-
)=
.
4X-
| 3 |
| 4 |
| 1 |
| 4 |
| X |
| 4 |
X-(
| 1 |
| 3 |
| 3 |
| 10 |
| 5 |
| 6 |
分析:(1)根据等式的基本性质,两边同加上
,变为4X=1,两边再同除以4即可;
(2)先把60%写成分数形式,原式变为
=
,根据比例的性质“两内项之积等于两外项之积”,写成方程形式5X=12,然后根据等式性质,两边同除以5即可;
(3)先计算
-
=
,原式变为X-
=
,两边再同加上
,计算即可.
| 3 |
| 4 |
(2)先把60%写成分数形式,原式变为
| X |
| 4 |
| 3 |
| 5 |
(3)先计算
| 1 |
| 3 |
| 3 |
| 10 |
| 1 |
| 30 |
| 1 |
| 30 |
| 5 |
| 6 |
| 1 |
| 30 |
解答:解:(1)4X-
=
,
4X-
+
=
+
,
4X=1,
4X÷4=1÷4,
X=
;
(2)
=60%,
=
,
5X=12,
5X÷5=12÷5,
X=2.4;
(3)X-(
-
)=
,
X-
=
,
X-
+
=
+
,
X=
+
,
X=
.
| 3 |
| 4 |
| 1 |
| 4 |
4X-
| 3 |
| 4 |
| 3 |
| 4 |
| 1 |
| 4 |
| 3 |
| 4 |
4X=1,
4X÷4=1÷4,
X=
| 1 |
| 4 |
(2)
| X |
| 4 |
| X |
| 4 |
| 3 |
| 5 |
5X=12,
5X÷5=12÷5,
X=2.4;
(3)X-(
| 1 |
| 3 |
| 3 |
| 10 |
| 5 |
| 6 |
X-
| 1 |
| 30 |
| 5 |
| 6 |
X-
| 1 |
| 30 |
| 1 |
| 30 |
| 5 |
| 6 |
| 1 |
| 30 |
X=
| 25 |
| 30 |
| 1 |
| 30 |
X=
| 13 |
| 15 |
点评:此题在解答时应注意解答格式,等号对齐,注意算完后在草纸上验算.
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