通分.(1)910和45(2)14和25(3)27和12(4)215和310.-数学

题目简介

通分.(1)910和45(2)14和25(3)27和12(4)215和310.-数学

题目详情

通分.
(1)
9
10
4
5
(2)
1
4
2
5
(3)
2
7
1
2
(4)
2
15
3
10
题型:解答题难度:中档来源:不详

答案

(1)class="stub"9
10

class="stub"4
5
=class="stub"4×2
5×2
=class="stub"8
10


(2)class="stub"1
4
=class="stub"1×5
4×5
=class="stub"5
20

class="stub"2
5
=class="stub"2×4
5×4
=class="stub"8
20


(3)class="stub"2
7
=class="stub"2×2
7×2
=class="stub"4
14

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


(4)class="stub"2
15
=class="stub"2×2
15×2
=class="stub"4
30

class="stub"3
10
=class="stub"3×3
10×3
=class="stub"9
30

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