题目内容
解方程.
(1)9x-3=
(2)x÷
+
=
(3)
x+
x=
.
(1)9x-3=
| 3 |
| 8 |
(2)x÷
| 5 |
| 6 |
| 1 |
| 5 |
| 4 |
| 5 |
(3)
| 2 |
| 3 |
| 1 |
| 6 |
| 1 |
| 2 |
分析:(1)依据等式性质,方程两边同时加3,再同时除以9求解,
(2)依据等式性质,方程两边同时减
,再同时乘
求解,
(3)先化简,再依据等式性质,方程两边同时除以
求解.
(2)依据等式性质,方程两边同时减
| 1 |
| 5 |
| 5 |
| 6 |
(3)先化简,再依据等式性质,方程两边同时除以
| 5 |
| 6 |
解答:解:(1)9x-3=
,
9x-3+3=
+3,
9x÷9=
÷9,
x=
;
(2)x÷
+
=
,
x÷
+
-
=
-
,
x÷
×
=
×
,
x=
;
(3)
x+
x=
,
x=
,
x÷
=
÷
,
x=
.
| 3 |
| 8 |
9x-3+3=
| 3 |
| 8 |
9x÷9=
| 27 |
| 8 |
x=
| 3 |
| 8 |
(2)x÷
| 5 |
| 6 |
| 1 |
| 5 |
| 4 |
| 5 |
x÷
| 5 |
| 6 |
| 1 |
| 5 |
| 1 |
| 5 |
| 4 |
| 5 |
| 1 |
| 5 |
x÷
| 5 |
| 6 |
| 5 |
| 6 |
| 3 |
| 5 |
| 5 |
| 6 |
x=
| 1 |
| 2 |
(3)
| 2 |
| 3 |
| 1 |
| 6 |
| 1 |
| 2 |
| 5 |
| 6 |
| 1 |
| 2 |
| 5 |
| 6 |
| 5 |
| 6 |
| 1 |
| 2 |
| 5 |
| 6 |
x=
| 3 |
| 5 |
点评:本题主要考查学生对于依据等式性质解方程能力.
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