先通分,再比较大小.78和5616和2947和34.-数学

题目简介

先通分,再比较大小.78和5616和2947和34.-数学

题目详情

先通分,再比较大小.
7
8
5
6
        
1
6
2
9
        
4
7
3
4
题型:解答题难度:中档来源:不详

答案

(1)class="stub"7
8
=class="stub"7×3
8×3
=class="stub"21
24

class="stub"5
6
=class="stub"5×4
6×4
=class="stub"20
24

所以class="stub"7
8
class="stub"5
6


(2)class="stub"1
6
=class="stub"1×3
6×3
=class="stub"3
18

class="stub"2
9
=class="stub"2×2
9×2
=class="stub"4
18

所以class="stub"1
6
class="stub"2
9


(3)class="stub"4
7
=class="stub"4×4
7×4
=class="stub"16
28

class="stub"3
4
=class="stub"3×7
4×7
=class="stub"21
28

所以class="stub"4
7
class="stub"3
4

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