计算1/10-1/5+1/6+1/15-1/30=一定要用简便方法!

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计算1/10-1/5+1/6+1/15-1/30=一定要用简便方法!
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计算1/10-1/5+1/6+1/15-1/30=一定要用简便方法!
计算1/10-1/5+1/6+1/15-1/30=
一定要用简便方法!

计算1/10-1/5+1/6+1/15-1/30=一定要用简便方法!
1/10 -1/5+1/6+1/15-1/30
=3/30 -6/30+5/30+2/30-1/30
=(3-6+5+2-1)/30
=3/30
=1/10