题目内容
| 解方程. 5-
|
(
|
|
分析:(1)依据等式的性质,方程两边同时加上
x,再同时减去
,再同时乘
求解,
(2)先化简为
x=
,再根据等式的性质,方程两边同时乘6 求解.
(3)依据等式的性质,方程两边同时乘x,再同时乘
求解,
| 5 |
| 6 |
| 1 |
| 3 |
| 6 |
| 5 |
(2)先化简为
| 1 |
| 6 |
| 1 |
| 3 |
(3)依据等式的性质,方程两边同时乘x,再同时乘
| 15 |
| 16 |
解答:解:(1)5-
x=
,
5-
x+
x=
+
x,
+
x=5,
+
x-
=5-
,
x×
=
×
,
x=
;
(2)(
-
)x=
,
x=
,
x×6=
×6,
x=2;
(3)
÷x=
,
÷x×x=
x,
x=
,
x×
=
×
,
x=2
.
| 5 |
| 6 |
| 1 |
| 3 |
5-
| 5 |
| 6 |
| 5 |
| 6 |
| 1 |
| 3 |
| 5 |
| 6 |
| 1 |
| 3 |
| 5 |
| 6 |
| 1 |
| 3 |
| 5 |
| 6 |
| 1 |
| 3 |
| 1 |
| 3 |
| 5 |
| 6 |
| 6 |
| 5 |
| 14 |
| 3 |
| 6 |
| 5 |
x=
| 28 |
| 5 |
(2)(
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 6 |
| 1 |
| 3 |
| 1 |
| 6 |
| 1 |
| 3 |
x=2;
(3)
| 8 |
| 3 |
| 16 |
| 15 |
| 8 |
| 3 |
| 16 |
| 15 |
| 16 |
| 15 |
| 8 |
| 3 |
| 16 |
| 15 |
| 15 |
| 16 |
| 8 |
| 3 |
| 15 |
| 16 |
x=2
| 1 |
| 2 |
点评:在解方程时应根据等式的性质,即等式两边同加上、同减去、同乘上或同除以某一个数(0除外),等式的两边仍相等,同时注意“=”上下要对齐.
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