题目内容
解方程.
x-
=
x+
=
x+
=
+x=1.
x-
| 1 |
| 3 |
| 1 |
| 5 |
x+
| 3 |
| 4 |
| 7 |
| 8 |
x+
| 1 |
| 6 |
| 11 |
| 12 |
| 3 |
| 5 |
分析:①根据等式的性质,方程的两边同加上
即可;
②根据等式的性质,方程的两边同减去
即可;
③根据等式的性质,方程的两边同减去
即可;
④根据等式的性质,方程的两边同减去
即可..
| 1 |
| 3 |
②根据等式的性质,方程的两边同减去
| 3 |
| 4 |
③根据等式的性质,方程的两边同减去
| 1 |
| 6 |
④根据等式的性质,方程的两边同减去
| 3 |
| 5 |
解答:解:①x-
=
x-
+
=
+
x=
;
②x+
=
x+
-
=
-
x=
;
③x+
=
x+
-
=
-
x=
;
④
+x=1
+x-
=1-
x=
.
| 1 |
| 3 |
| 1 |
| 5 |
x-
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 5 |
| 1 |
| 3 |
x=
| 8 |
| 15 |
②x+
| 3 |
| 4 |
| 7 |
| 8 |
x+
| 3 |
| 4 |
| 3 |
| 4 |
| 7 |
| 8 |
| 3 |
| 4 |
x=
| 1 |
| 8 |
③x+
| 1 |
| 6 |
| 11 |
| 12 |
x+
| 1 |
| 6 |
| 1 |
| 6 |
| 11 |
| 12 |
| 1 |
| 6 |
x=
| 3 |
| 4 |
④
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| 5 |
x=
| 2 |
| 5 |
点评:此题考查了根据等式的性质解方程,即等式两边同加上、同减去、同乘上或同除以一个不为0的数,等式仍相等.同时注意“=”上下要对齐.
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