题目内容
(1)将下面这个繁分数化为最简真分数;
.
(2)若下面的等式成立,x应该等于多少?
=
.
1 | ||||||
5+
|
(2)若下面的等式成立,x应该等于多少?
1 | ||||||
1+
|
8 |
11 |
考点:繁分数的化简
专题:计算问题(巧算速算)
分析:(1)对于阶梯式的繁分数化简,从下而上逐步进行,直至结果为整数、小数或最简分数为止.
(2)先化简等是左边的繁分数,然后根据解比例的方法求出未知数即可.
(2)先化简等是左边的繁分数,然后根据解比例的方法求出未知数即可.
解答:
解:(1)
=
=
=
=
=
=
(2)
=
=
=
=
=
=
=
96x+56=88x+66
8x=10
x=
1 | ||||||
5+
|
=
1 | ||||||
5+
|
=
1 | ||||
5+
|
=
1 | ||||
5+
|
=
1 | ||
5+
|
=
1 | ||
|
=
30 |
157 |
(2)
1 | ||||||
1+
|
8 |
11 |
1 | ||||||
1+
|
8 |
11 |
1 | ||||
1+
|
8 |
11 |
1 | ||||
1+
|
8 |
11 |
1 | ||
1+
|
8 |
11 |
1 | ||
|
8 |
11 |
8x+6 |
12x+7 |
8 |
11 |
96x+56=88x+66
8x=10
x=
5 |
4 |
点评:对于繁分数的化简,要一步步进行,有时还要注意运算的顺序.
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