题目内容
| 解方程. x×4=
|
|
x-
| ||||||||||||
|
7x÷
|
分析:(1)根据等式的性质,两边同除以4即可;
(2)根据等式的性质,两边同乘
即可;
(3)根据等式的性质,两边同乘
即可;
(4)根据等式的性质,两边同加上
即可;
(5)原式变为
x=
,两边同乘5即可;
(6)根据等式的性质,两边同乘
再同除以7即可.
(2)根据等式的性质,两边同乘
| 5 |
| 4 |
(3)根据等式的性质,两边同乘
| 2 |
| 5 |
(4)根据等式的性质,两边同加上
| 2 |
| 3 |
(5)原式变为
| 1 |
| 5 |
| 3 |
| 14 |
(6)根据等式的性质,两边同乘
| 5 |
| 6 |
解答:解:(1)x×4=
x×4÷4=
÷4
x=
(2)
x=20
x×
=20×
x=25
(3)x÷
=
x÷
×
=
×
x=
(4)x-
=
x-
+
=
+
x=
(5)
x-
x=
x=
x×5=
×5
x=
(6)7x÷
=
7x÷
×
=
×
7x=14
7x÷7=14÷7
x=2
| 8 |
| 11 |
x×4÷4=
| 8 |
| 11 |
x=
| 2 |
| 11 |
(2)
| 4 |
| 5 |
| 4 |
| 5 |
| 5 |
| 4 |
| 5 |
| 4 |
x=25
(3)x÷
| 2 |
| 5 |
| 7 |
| 15 |
x÷
| 2 |
| 5 |
| 2 |
| 5 |
| 7 |
| 15 |
| 2 |
| 5 |
x=
| 14 |
| 75 |
(4)x-
| 2 |
| 3 |
| 3 |
| 4 |
x-
| 2 |
| 3 |
| 2 |
| 3 |
| 3 |
| 4 |
| 2 |
| 3 |
x=
| 17 |
| 12 |
(5)
| 4 |
| 5 |
| 3 |
| 5 |
| 3 |
| 14 |
| 1 |
| 5 |
| 3 |
| 14 |
| 1 |
| 5 |
| 3 |
| 14 |
x=
| 15 |
| 14 |
(6)7x÷
| 5 |
| 6 |
| 84 |
| 5 |
7x÷
| 5 |
| 6 |
| 5 |
| 6 |
| 84 |
| 5 |
| 5 |
| 6 |
7x=14
7x÷7=14÷7
x=2
点评:此题考查了根据等式的性质解方程,即等式两边同加上、同减去、同乘上或同除以一个不为0的数,等式仍相等.同时注意“=”上下要对齐.
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