题目内容
x×(1+
|
|
|
分析:(1)先化简方程,再依据等式的性质,方程两边同时除以1.25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)依据等式的性质,方程两边同时加
,再同时除以
求解.
(2)依据等式的性质,方程两边同时乘x,再同时除以
| 3 |
| 8 |
(3)依据等式的性质,方程两边同时加
| 3 |
| 4 |
| 15 |
| 16 |
解答:解:(1)x×(1+
)=60,
1.25x=60,
1.25x÷1.25=60÷1.25,
x=48;
(2)
÷x=
,
÷x×x=
×x,
=
x,
÷
=
x÷
,
x=2;
(3)
x-
=
,
x-
+
=
+
,
x=1,
x÷
=1÷
,
x=1
.
| 1 |
| 4 |
1.25x=60,
1.25x÷1.25=60÷1.25,
x=48;
(2)
| 3 |
| 4 |
| 3 |
| 8 |
| 3 |
| 4 |
| 3 |
| 8 |
| 3 |
| 4 |
| 3 |
| 8 |
| 3 |
| 4 |
| 3 |
| 8 |
| 3 |
| 8 |
| 3 |
| 8 |
x=2;
(3)
| 15 |
| 16 |
| 3 |
| 4 |
| 1 |
| 4 |
| 15 |
| 16 |
| 3 |
| 4 |
| 3 |
| 4 |
| 1 |
| 4 |
| 3 |
| 4 |
| 15 |
| 16 |
| 15 |
| 16 |
| 15 |
| 16 |
| 15 |
| 16 |
x=1
| 1 |
| 15 |
点评:本题主要考查学生依据等式的性质解方程的能力,解答时注意对齐等号.
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