题目内容
解方程
5x-
=
x=
×
x÷
=12.
5x-
| 1 |
| 3 |
| 2 |
| 3 |
| 8 |
| 9 |
| 1 |
| 6 |
| 16 |
| 5 |
| 2 |
| 3 |
| 1 |
| 4 |
分析:(1)根据等式的性质,在方程两边同时加上
,再除以5求解,
(2)先化简,再根据等式的性质,在方程两边同时乘上
求解,
(3)先化简,再根据等式的性质,在方程两边同时乘上
求解,
| 1 |
| 3 |
(2)先化简,再根据等式的性质,在方程两边同时乘上
| 9 |
| 8 |
(3)先化简,再根据等式的性质,在方程两边同时乘上
| 3 |
| 8 |
解答:解:(1)5x-
=
,
5x-
+
=
+
,
5x÷5=1÷5,
x=0.2;
(2)
x=
×
,
x=
,
x×
=
×
,
x=
;
(3)
x÷
=12,
x=12,
x×
=12×
,
x=4.5.
| 1 |
| 3 |
| 2 |
| 3 |
5x-
| 1 |
| 3 |
| 1 |
| 3 |
| 2 |
| 3 |
| 1 |
| 3 |
5x÷5=1÷5,
x=0.2;
(2)
| 8 |
| 9 |
| 1 |
| 6 |
| 16 |
| 5 |
| 8 |
| 9 |
| 8 |
| 15 |
| 8 |
| 9 |
| 9 |
| 8 |
| 8 |
| 15 |
| 9 |
| 8 |
x=
| 3 |
| 5 |
(3)
| 2 |
| 3 |
| 1 |
| 4 |
| 8 |
| 3 |
| 8 |
| 3 |
| 3 |
| 8 |
| 3 |
| 8 |
x=4.5.
点评:本题考查了学生根据等式的性质解方程的能力,注意等号对齐.
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