题目内容
求未知数 x的值.
x+
x=
5x-3×
=
:0.375=
:x.
| 1 |
| 2 |
| 1 |
| 3 |
| 3 |
| 4 |
5x-3×
| 10 |
| 7 |
| 7 |
| 5 |
| 3 |
| 8 |
| 3 |
| 4 |
考点:方程的解和解方程,解比例
专题:简易方程
分析:(1)首先化简方程的左边得出
x=
,然后两边同除以
即可;
(2)首先化简方程的左边得出5x-
=
,然后两边同时加
,再同时除以5即可;
(3)把
转化成0.375,然后直接根据比例的基本性质即可求出x的值.
| 5 |
| 6 |
| 3 |
| 4 |
| 5 |
| 6 |
(2)首先化简方程的左边得出5x-
| 30 |
| 7 |
| 7 |
| 5 |
| 30 |
| 7 |
(3)把
| 3 |
| 8 |
解答:
解:(1)
x+
x=
x=
x÷
=
÷
x=
(2)5x-3×
=
5x-
=
5x-
+
=
+
5x=
5x÷5=
÷5
x=
(3)
:0.375=
:x
0.375:0.375=
:x
x=
| 1 |
| 2 |
| 1 |
| 3 |
| 3 |
| 4 |
| 5 |
| 6 |
| 3 |
| 4 |
| 5 |
| 6 |
| 5 |
| 6 |
| 3 |
| 4 |
| 5 |
| 6 |
x=
| 9 |
| 10 |
(2)5x-3×
| 10 |
| 7 |
| 7 |
| 5 |
5x-
| 30 |
| 7 |
| 7 |
| 5 |
5x-
| 30 |
| 7 |
| 30 |
| 7 |
| 7 |
| 5 |
| 30 |
| 7 |
5x=
| 199 |
| 35 |
5x÷5=
| 199 |
| 35 |
x=
| 199 |
| 175 |
(3)
| 3 |
| 8 |
| 3 |
| 4 |
0.375:0.375=
| 3 |
| 4 |
x=
| 3 |
| 4 |
点评:此题考查学生利用比例的基本性质和等式的性质来解方程的能力,注意等号对齐.
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