把下面各分数通分,并比较大小.27和75310和2734和56315和2724.-数学

题目简介

把下面各分数通分,并比较大小.27和75310和2734和56315和2724.-数学

题目详情

把下面各分数通分,并比较大小.
2
7
7
5

3
10
2
7
3
4
5
6
3
15
27
24
题型:填空题难度:中档来源:不详

答案

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

class="stub"2
7
=class="stub"2×5
7×5
=class="stub"10
35

class="stub"7
5
=class="stub"7×7
5×7
=class="stub"49
35

class="stub"10
35
<class="stub"49
35

所以class="stub"2
7
class="stub"7
5


(2)class="stub"3
10
class="stub"2
7

class="stub"3
10
=class="stub"3×7
10×7
=class="stub"21
70

class="stub"2
7
=class="stub"2×10
7×10
=class="stub"20
70

class="stub"21
70
>class="stub"20
70

所以class="stub"3
10
>class="stub"2
7


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

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

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

class="stub"9
12
class="stub"10
12

所以class="stub"3
4
<class="stub"5
6


(4)class="stub"3
15
class="stub"27
24

class="stub"3
15
=class="stub"3×8
15×8
=class="stub"24
120

class="stub"27
24
=class="stub"27×5
24×5
=class="stub"135
120

class="stub"24
120
<class="stub"135
120

所以class="stub"3
15
class="stub"27
24

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