题目内容
解方程:
(1)
X+
=
; (2)
X-
X=
.
(1)
| 11 |
| 2 |
| 1 |
| 6 |
| 5 |
| 8 |
| 1 |
| 3 |
| 1 |
| 4 |
| 7 |
| 30 |
分析:(1)根据等式的性质,两边同减去
,再同乘
即可;
(2)原式变为
X=
,根据等式的性质,两边同乘12即可.
| 1 |
| 6 |
| 2 |
| 11 |
(2)原式变为
| 1 |
| 12 |
| 7 |
| 30 |
解答:解:(1)
X+
=
X+
-
=
-
X=
X×
=
×
X=
;
(2)
X-
X=
X=
X×12=
×12
X=
.
| 11 |
| 2 |
| 1 |
| 6 |
| 5 |
| 8 |
| 11 |
| 2 |
| 1 |
| 6 |
| 1 |
| 6 |
| 5 |
| 8 |
| 1 |
| 6 |
| 11 |
| 2 |
| 11 |
| 24 |
| 11 |
| 2 |
| 2 |
| 11 |
| 11 |
| 24 |
| 2 |
| 11 |
X=
| 1 |
| 12 |
(2)
| 1 |
| 3 |
| 1 |
| 4 |
| 7 |
| 30 |
| 1 |
| 12 |
| 7 |
| 30 |
| 1 |
| 12 |
| 7 |
| 30 |
X=
| 14 |
| 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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