题目内容
解方程.
x÷
|
x×
|
x÷
|
|
分析:(1)依据等式的性质,方程两边同时乘
求解,
(2)依据等式的性质,方程两边同时除以
求解,
(3)依据等式的性质,方程两边同时乘
求解,
(4)依据等式的性质,方程两边同时除以
求解.
| 1 |
| 6 |
(2)依据等式的性质,方程两边同时除以
| 7 |
| 15 |
(3)依据等式的性质,方程两边同时乘
| 6 |
| 7 |
(4)依据等式的性质,方程两边同时除以
| 2 |
| 5 |
解答:解:(1)x÷
=
,
x÷
×
=
×
,
x=
;
(2)x×
=
,
x×
÷
=
÷
,
x=
;
(3)x÷
=
,
x÷
×
=
×
,
x=
;
(4)
x=
,
x÷
=
÷
,
x=1.8.
| 1 |
| 6 |
| 3 |
| 4 |
x÷
| 1 |
| 6 |
| 1 |
| 6 |
| 3 |
| 4 |
| 1 |
| 6 |
x=
| 1 |
| 8 |
(2)x×
| 7 |
| 15 |
| 2 |
| 5 |
x×
| 7 |
| 15 |
| 7 |
| 15 |
| 2 |
| 5 |
| 7 |
| 15 |
x=
| 6 |
| 7 |
(3)x÷
| 6 |
| 7 |
| 1 |
| 3 |
x÷
| 6 |
| 7 |
| 6 |
| 7 |
| 1 |
| 3 |
| 6 |
| 7 |
x=
| 2 |
| 7 |
(4)
| 2 |
| 5 |
| 18 |
| 25 |
| 2 |
| 5 |
| 2 |
| 5 |
| 18 |
| 25 |
| 2 |
| 5 |
x=1.8.
点评:等式的性质是解方程的依据,解方程时注意对齐等号.
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