把下列每组分数化成分母相同而大小不变的分数.23和3445和7151318和512.-数学

题目简介

把下列每组分数化成分母相同而大小不变的分数.23和3445和7151318和512.-数学

题目详情

把下列每组分数化成分母相同而大小不变的分数.
2
3
3
4
4
5
7
15
13
18
5
12
题型:解答题难度:中档来源:不详

答案

class="stub"2
3
class="stub"3
4

class="stub"2
3
=class="stub"2×4
3×4
=class="stub"8
12

class="stub"3
4
=class="stub"3×3
4×3
=class="stub"9
12

class="stub"4
5
class="stub"7
15

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

class="stub"7
15
=class="stub"7
15

class="stub"13
18
class="stub"5
12

class="stub"13
18
=class="stub"13×2
18×2
=class="stub"26
36

class="stub"5
12
=class="stub"5×3
12×3
=class="stub"15
36

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