题目内容
解方程
x÷
=
x+
x=
13-
x=10.
| 5 |
| 7 |
| 5 |
| 14 |
| 7 |
| 8 |
| 4 |
| 5 |
| 2 |
| 3 |
| 1 |
| 5 |
13-
| 3 |
| 8 |
分析:(1)依据等式的性质,方程两边同时乘
,再同时除以
求解,
(2)先化简方程,再依据等式的性质,方程两边同时除以
求解,
(3)依据等式的性质,方程两边同时加
x,再同时减10,最后同时除以
求解.
| 5 |
| 14 |
| 5 |
| 7 |
(2)先化简方程,再依据等式的性质,方程两边同时除以
| 22 |
| 15 |
(3)依据等式的性质,方程两边同时加
| 3 |
| 8 |
| 3 |
| 8 |
解答:解:(1)
x÷
=
x÷
×
=
×
x÷
=
÷
x=
;
(2)
x+
x=
x=
x÷
=
÷
x=
;
(3)13-
x=10
13-
x+
x=10+
x
13-10=10+
x-10
3÷
=
x÷
x=8.
.
| 5 |
| 7 |
| 5 |
| 14 |
| 7 |
| 8 |
| 5 |
| 7 |
| 5 |
| 14 |
| 5 |
| 14 |
| 7 |
| 8 |
| 5 |
| 14 |
| 5 |
| 7 |
| 5 |
| 7 |
| 5 |
| 16 |
| 5 |
| 7 |
x=
| 7 |
| 16 |
(2)
| 4 |
| 5 |
| 2 |
| 3 |
| 1 |
| 5 |
| 22 |
| 15 |
| 1 |
| 5 |
| 22 |
| 15 |
| 22 |
| 15 |
| 1 |
| 5 |
| 22 |
| 15 |
x=
| 3 |
| 22 |
(3)13-
| 3 |
| 8 |
13-
| 3 |
| 8 |
| 3 |
| 8 |
| 3 |
| 8 |
13-10=10+
| 3 |
| 8 |
3÷
| 3 |
| 8 |
| 3 |
| 8 |
| 3 |
| 8 |
x=8.
.
点评:本题主要考查学生依据等式的性质,以及比例基本性质解方程的能力,解方程时注意对齐等号.
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