把下面各组分数通分.12和37215和7823和4534和1748.-数学

题目简介

把下面各组分数通分.12和37215和7823和4534和1748.-数学

题目详情

把下面各组分数通分.
1
2
3
7

2
15
7
8

2
3
4
5

3
4
17
48
题型:解答题难度:中档来源:不详

答案

(1)class="stub"1
2
=class="stub"1×7
2×7
=class="stub"7
14

class="stub"3×2
7×2
=class="stub"6
14


(2)class="stub"2
15
class="stub"2×8
15×8
=class="stub"16
120

class="stub"7
8
=class="stub"7×15
8×15
=class="stub"105
120


(3)class="stub"2
3
=class="stub"2×5
3×5
=class="stub"10
15

class="stub"4
5
=class="stub"4×3
5×3
=class="stub"12
15


(4)class="stub"3
4
=class="stub"3×12
4×12
=class="stub"36
48

class="stub"17
48
=class="stub"17
48

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