题目内容
解方程.
①3x=
②x÷
=
③
x÷
=14.
①3x=
| 3 |
| 8 |
②x÷
| 2 |
| 7 |
| 7 |
| 16 |
③
| 1 |
| 5 |
| 2 |
| 7 |
考点:方程的解和解方程
专题:简易方程
分析:①方程两边同时除以3,然后求解即可;
②方程两边同时乘以
,然后求解;
③方程两边先同时乘以
,再同时除以
即可.
②方程两边同时乘以
| 2 |
| 7 |
③方程两边先同时乘以
| 2 |
| 7 |
| 1 |
| 5 |
解答:
解:
①3x=
3x÷3=
÷3
x=
;
②x÷
=
x÷
×
=
×
x=
;
③
x÷
=14
x÷
×
=14×
x=4
x÷
=4÷
x=20
①3x=
| 3 |
| 8 |
3x÷3=
| 3 |
| 8 |
x=
| 1 |
| 8 |
②x÷
| 2 |
| 7 |
| 7 |
| 16 |
x÷
| 2 |
| 7 |
| 2 |
| 7 |
| 7 |
| 16 |
| 2 |
| 7 |
x=
| 1 |
| 8 |
③
| 1 |
| 5 |
| 2 |
| 7 |
| 1 |
| 5 |
| 2 |
| 7 |
| 2 |
| 7 |
| 2 |
| 7 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
| 1 |
| 5 |
x=20
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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