> 数学 >
2÷3÷7+4÷6÷14+14÷21÷49
4÷7÷9+8÷14÷18+28÷49÷63
=______.
人气:236 ℃ 时间:2020-04-13 12:42:54
解答
原式=
1
3
×
1
7
+4×
1
6
×
1
14
+14×
1
21
×
1
49
    
1
7
×
1
9
+8×
1
14
×
1
18
+28×
1
49
×
1
63
 

=
2
21
(1+
1
2
+
1
7
4
63
( 1+
1
2
+
1
7
)

=
3
2
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