题目内容
解方程.
2x-
=
x÷
=
x+
=
.
2x-
| 1 |
| 3 |
| 5 |
| 6 |
x÷
| 4 |
| 9 |
| 63 |
| 75 |
| 1 |
| 3 |
| 1 |
| 4 |
| 2 |
| 3 |
分析:(1)根据等式的性质,在方程两边同时加上
,再同时除以2求解,
(2)根据等式的性质,在方程两边同时乘以
求解,
(3)根据等式的性质,在方程两边同时减去
,再同时除以
求解.
| 1 |
| 3 |
(2)根据等式的性质,在方程两边同时乘以
| 4 |
| 9 |
(3)根据等式的性质,在方程两边同时减去
| 1 |
| 4 |
| 1 |
| 3 |
解答:解:(1)2x-
=
,
2x-
+
=
+
,
2x=
,
2x÷2=
÷2,
x=
;
(2)x÷
=
,
x÷
×
=
×
,
x=
;
(3)
x+
=
,
x+
-
=
-
,
x=
,
x÷
=
÷
,
x=
.
| 1 |
| 3 |
| 5 |
| 6 |
2x-
| 1 |
| 3 |
| 1 |
| 3 |
| 5 |
| 6 |
| 1 |
| 3 |
2x=
| 7 |
| 6 |
2x÷2=
| 7 |
| 6 |
x=
| 7 |
| 12 |
(2)x÷
| 4 |
| 9 |
| 63 |
| 75 |
x÷
| 4 |
| 9 |
| 4 |
| 9 |
| 63 |
| 75 |
| 4 |
| 9 |
x=
| 28 |
| 75 |
(3)
| 1 |
| 3 |
| 1 |
| 4 |
| 2 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 4 |
| 2 |
| 3 |
| 1 |
| 4 |
| 1 |
| 3 |
| 5 |
| 12 |
| 1 |
| 3 |
| 1 |
| 3 |
| 5 |
| 12 |
| 1 |
| 3 |
x=
| 5 |
| 4 |
点评:本题考查了学生根据等式的性质解答方程的能力,注意等号对齐.
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