Question

二分之一+6分之1+10二分之一+2十分之一+3十分之一？

Answer 1

1/3+1/5+1/6+1/10+1/12+1/20
=1/3+1/5+1/(2×3)+1/(2×5)+1/颂衫(3×4)+1/(4×5)
=1/3+1/5+1/2-1/3+1/2-1/5+1/3-1/余蠢4+1/4-1/5
=1/2+1/2+1/3-1/5
=4/3-1/5
=20/15-3/野毁腔15
=17/15

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Answer 2

答：依题意得
1/2+1/6+1/12+1/20+1/30
＝1/2+（1/2-1/3）+（1/3-
1/4）+（1/4-1/5）+（1/5-
1/6）
＝1/2+1/2-（1/3-1/3）-（1/4-1/4）-（1/5-1/5）-1/6，
＝1-1/6
＝5/6。

Answer 3

答：
1/2+1/6+1/12+1/20+1/30
=6/12+2/12+1/12+3/60+2/60
=9/12+5/60
=9/12+1/12
=10/12
=5/6