题目内容
解下列方程.
x÷
=
x-18×
=4
x+
x=
.
x÷
| 5 |
| 8 |
| 3 |
| 5 |
| 4 |
| 5 |
| 2 |
| 3 |
x+
| 3 |
| 5 |
| 16 |
| 17 |
分析:(1)根据等式的性质,在方程两边同时乘上
求解,
(2)先化简,再根据等式的性质,在方程两边同时加上12,再乘上
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,
| 5 |
| 8 |
(2)先化简,再根据等式的性质,在方程两边同时加上12,再乘上
| 5 |
| 4 |
(3)先化简,再根据等式的性质,在方程两边同时乘上
| 5 |
| 8 |
解答:解:(1)x÷
=
,
x÷
×
=
×
,
x=
;
(2)
x-18×
=4,
x-12=4,
x-12+12=4+12,
x×
=16×
,
x=20;
(3)x+
x=
,
x=
,
x×
=
×
,
x=
.
| 5 |
| 8 |
| 3 |
| 5 |
x÷
| 5 |
| 8 |
| 5 |
| 8 |
| 3 |
| 5 |
| 5 |
| 8 |
x=
| 3 |
| 8 |
(2)
| 4 |
| 5 |
| 2 |
| 3 |
| 4 |
| 5 |
| 4 |
| 5 |
| 4 |
| 5 |
| 5 |
| 4 |
| 5 |
| 4 |
x=20;
(3)x+
| 3 |
| 5 |
| 16 |
| 17 |
| 8 |
| 5 |
| 16 |
| 17 |
| 8 |
| 5 |
| 5 |
| 8 |
| 16 |
| 17 |
| 5 |
| 8 |
x=
| 10 |
| 17 |
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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