题目内容
解方程
|
| ||||||||
|
x÷
|
分析:(1)依据等式的性质,方程两边同时除以
求解,
(2)依据等式的性质,方程两边同时除以
求解,
(3)依据等式的性质,方程两边同时减
求解,
(4)依据等式的性质,方程两边同时乘
求解.
| 1 |
| 4 |
(2)依据等式的性质,方程两边同时除以
| 4 |
| 5 |
(3)依据等式的性质,方程两边同时减
| 3 |
| 4 |
(4)依据等式的性质,方程两边同时乘
| 14 |
| 15 |
解答:解:(1)
x=5
x÷
=5÷
x=20;
(2)
x=
x÷
=
÷
x=
;
(3)
+x=
+x-
=
-
x=
;
(4)x÷
=
x÷
×
=
×
x=
.
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 4 |
x=20;
(2)
| 4 |
| 5 |
| 3 |
| 10 |
| 4 |
| 5 |
| 4 |
| 5 |
| 3 |
| 10 |
| 4 |
| 5 |
x=
| 3 |
| 8 |
(3)
| 3 |
| 4 |
| 8 |
| 9 |
| 3 |
| 4 |
| 3 |
| 4 |
| 8 |
| 9 |
| 3 |
| 4 |
x=
| 5 |
| 36 |
(4)x÷
| 14 |
| 15 |
| 1 |
| 7 |
x÷
| 14 |
| 15 |
| 14 |
| 15 |
| 1 |
| 7 |
| 14 |
| 15 |
x=
| 2 |
| 15 |
点评:本题主要考查学生依据等式的性质解方程的能力,解方程时注意对齐等号.
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