题目内容
解方程:
5X-3×
=
5-
X=
2X-
X=
.
5X-3×
| 10 |
| 7 |
| 5 |
| 7 |
| 2 |
| 3 |
| 1 |
| 3 |
| 4 |
| 3 |
| 1 |
| 2 |
分析:(1)先化简方程,再依据等式的性质,方程两边同时加
,最后同时除以5求解,
(2)依据等式的性质,方程两边同时加
x,再同时减
,最后同时除以
求解,
(3)先化简方程,再依据等式的性质,方程两边同时除以
求解.
| 30 |
| 7 |
(2)依据等式的性质,方程两边同时加
| 2 |
| 3 |
| 1 |
| 3 |
| 2 |
| 3 |
(3)先化简方程,再依据等式的性质,方程两边同时除以
| 2 |
| 3 |
解答:解:(1)5X-3×
=
,
5X-
+
=
+
,
5x÷5=5÷5,
x=1;
(2)5-
X=
,
5-
X+
x=
+
x,
5-
=
+
x-
,
÷
=
x÷
,
x=7;
(3)2X-
X=
,
x=
,
x÷
=
÷
,
x=
.
| 10 |
| 7 |
| 5 |
| 7 |
5X-
| 30 |
| 7 |
| 30 |
| 7 |
| 5 |
| 7 |
| 30 |
| 7 |
5x÷5=5÷5,
x=1;
(2)5-
| 2 |
| 3 |
| 1 |
| 3 |
5-
| 2 |
| 3 |
| 2 |
| 3 |
| 1 |
| 3 |
| 2 |
| 3 |
5-
| 1 |
| 3 |
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 3 |
| 14 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
| 2 |
| 3 |
x=7;
(3)2X-
| 4 |
| 3 |
| 1 |
| 2 |
| 2 |
| 3 |
| 1 |
| 2 |
| 2 |
| 3 |
| 2 |
| 3 |
| 1 |
| 2 |
| 2 |
| 3 |
x=
| 3 |
| 4 |
点评:解方程的依据是等式的性质,解方程时要注意:(1)方程能化简先化简,(2)等号要对齐.
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| 5X-3× |