题目内容
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 5 |
| 2 |
| 3 |
分析:先算
+
=
,根据等式的性质,两边同加上
x,得
+
x=
,两边同减去
,在同乘2即可.
| 2 |
| 3 |
| 1 |
| 5 |
| 13 |
| 15 |
| 1 |
| 2 |
| 2 |
| 3 |
| 1 |
| 2 |
| 13 |
| 15 |
| 2 |
| 3 |
解答:解:
-
x+
=
,
-
x=
,
-
x+
x=
+
x,
+
x=
,
+
x-
=
-
,
x=
,
x×2=
×2,
x=
.
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 5 |
| 2 |
| 3 |
| 13 |
| 15 |
| 1 |
| 2 |
| 2 |
| 3 |
| 13 |
| 15 |
| 1 |
| 2 |
| 1 |
| 2 |
| 2 |
| 3 |
| 1 |
| 2 |
| 2 |
| 3 |
| 1 |
| 2 |
| 13 |
| 15 |
| 2 |
| 3 |
| 1 |
| 2 |
| 2 |
| 3 |
| 13 |
| 15 |
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 5 |
| 1 |
| 2 |
| 1 |
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x=
| 2 |
| 5 |
点评:此题考查了根据等式的性质解方程,即等式两边同加、同减、同乘或同除以一个数(0除外),等式的左右两边仍相等;注意“=”上下要对齐.
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