题目内容
解方程.
(1)
|
(2)
|
(3)X-
|
(4)
|
分析:(1)依据等式的性质,方程两边同时除以
求解,
(2)先化简方程是
x=
,再依据等式的性质,方程两边同时除以
求解,
(3)先化简方程是x-
=
,再依据等式的性质,方程两边同时加上
求解,
(4)依据等式的性质,方程两边同时乘以
,再同时除以
求解.
| 8 |
| 9 |
(2)先化简方程是
| 1 |
| 12 |
| 7 |
| 30 |
| 1 |
| 12 |
(3)先化简方程是x-
| 6 |
| 7 |
| 6 |
| 7 |
| 6 |
| 7 |
(4)依据等式的性质,方程两边同时乘以
| 1 |
| 8 |
| 3 |
| 4 |
解答:解:(1)
x=
,
x÷
=
÷
,
x=
;
(2)
x-
x=
,
x=
,
x÷
=
÷
,
x=2
;
(3)x-
=
×2,
x-
+
=
+
,
x=1
;
(4)
x÷
=16,
x÷
×
=16×
,
x÷
=2÷
,
x=2
.
| 8 |
| 9 |
| 5 |
| 6 |
| 8 |
| 9 |
| 8 |
| 9 |
| 5 |
| 6 |
| 8 |
| 9 |
x=
| 15 |
| 16 |
(2)
| 1 |
| 3 |
| 1 |
| 4 |
| 7 |
| 30 |
| 1 |
| 12 |
| 7 |
| 30 |
| 1 |
| 12 |
| 1 |
| 12 |
| 7 |
| 30 |
| 1 |
| 12 |
x=2
| 4 |
| 5 |
(3)x-
| 6 |
| 7 |
| 3 |
| 7 |
x-
| 6 |
| 7 |
| 6 |
| 7 |
| 6 |
| 7 |
| 6 |
| 7 |
x=1
| 5 |
| 7 |
(4)
| 3 |
| 4 |
| 1 |
| 8 |
| 3 |
| 4 |
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 8 |
| 3 |
| 4 |
| 3 |
| 4 |
| 3 |
| 4 |
x=2
| 2 |
| 3 |
点评:本题主要考查学生依据等式的性质解方程的能力,解答时注意对齐等号.
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