通分.(把下列各组分数化成分母相同的分数)(1)13和59(2)25和17(3)56和34(4)58和112.-数学

题目简介

通分.(把下列各组分数化成分母相同的分数)(1)13和59(2)25和17(3)56和34(4)58和112.-数学

题目详情

通分.(把下列各组分数化成分母相同的分数)
(1)
1
3
5
9
(2)
2
5
1
7
(3)
5
6
3
4
(4)
5
8
1
12
题型:解答题难度:中档来源:不详

答案

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

class="stub"1
3
=class="stub"1×3
3×3
=class="stub"3
9

class="stub"5
9
=class="stub"5
9


(2)class="stub"2
5
class="stub"1
7

class="stub"2
5
=class="stub"2×7
5×7
=class="stub"14
35

class="stub"1
7
=class="stub"1×5
7×5
=class="stub"5
35


(3)class="stub"5
6
class="stub"3
4

class="stub"5
6
=class="stub"5×2
6×2
=class="stub"10
12

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


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

class="stub"5
8
=class="stub"5×3
8×3
=class="stub"15
24

class="stub"1
12
=class="stub"1×2
12×2
=class="stub"2
24

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