题目内容
解方程
X+
=
-X=
X-(
+
)=
.
X+
| 1 |
| 8 |
| 3 |
| 4 |
| 17 |
| 24 |
| 1 |
| 3 |
X-(
| 1 |
| 3 |
| 1 |
| 4 |
| 5 |
| 12 |
分析:(1)根据等式的性质,方程两边同时减去
.
(2)根据等式的性质,方程两边同时加上x,再同时减去
.
(3)先算出
+
的结果,再根据等式的性质,方程两边同时加上
.
| 1 |
| 8 |
(2)根据等式的性质,方程两边同时加上x,再同时减去
| 1 |
| 3 |
(3)先算出
| 1 |
| 3 |
| 1 |
| 4 |
| 7 |
| 12 |
解答:解:(1)x+
=
,
x+
-
=
-
,
x=
;
(2)
-x=
,
-x+x=
+x,
=
+x,
-
=
+x-
,
x=
,
x=
;
(3)x-(
+
)=
,
x-
=
,
x-
+
=
+
,
x=1.
| 1 |
| 8 |
| 3 |
| 4 |
x+
| 1 |
| 8 |
| 1 |
| 8 |
| 3 |
| 4 |
| 1 |
| 8 |
x=
| 5 |
| 8 |
(2)
| 17 |
| 24 |
| 1 |
| 3 |
| 17 |
| 24 |
| 1 |
| 3 |
| 17 |
| 24 |
| 1 |
| 3 |
| 17 |
| 24 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 3 |
x=
| 9 |
| 24 |
x=
| 3 |
| 8 |
(3)x-(
| 1 |
| 3 |
| 1 |
| 4 |
| 5 |
| 12 |
x-
| 7 |
| 12 |
| 5 |
| 12 |
x-
| 7 |
| 12 |
| 7 |
| 12 |
| 5 |
| 12 |
| 7 |
| 12 |
x=1.
点评:这三道题主要考察了学生对于等式性质的掌握,同时要注意对齐等号.
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