题目内容
解方程.
Χ=
÷χ=
Χ-
Χ=
.
| 5 |
| 12 |
| 2 |
| 3 |
| 3 |
| 5 |
| 6 |
| 7 |
Χ-
| 4 |
| 9 |
| 10 |
| 21 |
分析:(1)依据等式的性质,方程两边同时除以
求解,
(2)依据等式的性质,方程两边同时乘x,再同时除以
求解,
(3)先化简方程,再依据等式的性质,方程两边同时除以
求解.
| 5 |
| 12 |
(2)依据等式的性质,方程两边同时乘x,再同时除以
| 6 |
| 7 |
(3)先化简方程,再依据等式的性质,方程两边同时除以
| 5 |
| 9 |
解答:解:(1)
x=
,
x÷
=
÷
,
x=1.6;
(2)
÷x=
,
÷x×x=
×x,
=
x,
÷
=
x÷
,
x=0.7;
(3)x-
x=
,
x=
,
x÷
=
÷
,
x=
.
| 5 |
| 12 |
| 2 |
| 3 |
| 5 |
| 12 |
| 5 |
| 12 |
| 2 |
| 3 |
| 5 |
| 12 |
x=1.6;
(2)
| 3 |
| 5 |
| 6 |
| 7 |
| 3 |
| 5 |
| 6 |
| 7 |
| 3 |
| 5 |
| 6 |
| 7 |
| 3 |
| 5 |
| 6 |
| 7 |
| 6 |
| 7 |
| 6 |
| 7 |
x=0.7;
(3)x-
| 4 |
| 9 |
| 10 |
| 21 |
| 5 |
| 9 |
| 10 |
| 21 |
| 5 |
| 9 |
| 5 |
| 9 |
| 10 |
| 21 |
| 5 |
| 9 |
x=
| 6 |
| 7 |
点评:本题主要考查学生运用等式的性质解方程的能力.
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