比较大小.37______5956______78712-14______1423+25______45+13.-数学

题目简介

比较大小.37______5956______78712-14______1423+25______45+13.-数学

题目详情

比较大小.
3
7
______
5
9
5
6
______
7
8
7
12
-
1
4
______
1
4
2
3
+
2
5
______
4
5
+
1
3
题型:填空题难度:中档来源:不详

答案

(1)class="stub"3
7
=class="stub"27
63
class="stub"5
9
=class="stub"35
63

所以class="stub"27
63
<class="stub"35
63
,即class="stub"3
7
class="stub"5
9


(2)class="stub"5
6
=class="stub"20
24
class="stub"7
8
=class="stub"21
24

因为class="stub"20
24
<class="stub"21
24
,所以class="stub"5
6
<class="stub"7
8


(3)class="stub"7
12
-class="stub"1
4
=class="stub"7
12
-class="stub"3
12
=class="stub"1
3

根据同分子分数的大小比较可知:
class="stub"1
3
>class="stub"1
4
,即class="stub"7
12
-class="stub"1
4
>class="stub"1
4


(4)class="stub"2
3
+class="stub"2
5
=class="stub"10
15
+class="stub"6
15
=class="stub"16
15

class="stub"4
5
+class="stub"1
3
=class="stub"12
15
+class="stub"5
15
=class="stub"17
15

因为class="stub"16
15
<class="stub"17
15
,所以class="stub"2
3
+class="stub"2
5
<class="stub"4
5
+class="stub"1
3

故答案为:<、<、>、<.

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