把下面每组分数通分.(1)38和512(2)35和19(3)57和328(4)310、512和715.-五年级数学

题目简介

把下面每组分数通分.(1)38和512(2)35和19(3)57和328(4)310、512和715.-五年级数学

题目详情

把下面每组分数通分.
(1)
3
8
5
12

(2)
3
5
1
9

(3)
5
7
3
28

(4)
3
10
5
12
7
15
题型:解答题难度:中档来源:不详

答案

(1)class="stub"3
8
class="stub"5
12

class="stub"3
8
=class="stub"3×3
8×3
=class="stub"9
24

class="stub"5
12
=class="stub"5×2
12×2
=class="stub"10
24


(2)class="stub"3
5
class="stub"1
9

class="stub"3
5
=class="stub"3×9
5×9
=class="stub"27
45

class="stub"1
9
=class="stub"1×5
9×5
=class="stub"5
45


(3)class="stub"5
7
class="stub"3
28

class="stub"5
7
=class="stub"5×4
7×4
=class="stub"20
28

class="stub"3
28
=class="stub"3
28


(4)class="stub"3
10
class="stub"5
12
class="stub"7
15

class="stub"3
10
=class="stub"3×6
10×6
=class="stub"18
60

class="stub"5
12
=class="stub"5×5
12×5
=class="stub"25
60

class="stub"7
15
=class="stub"7×4
15×4
=class="stub"28
60

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