1/2+5/6+11/12+19/20+20/30怎么做,

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1/2+5/6+11/12+19/20+20/30怎么做,

1/2+5/6+11/12+19/20+20/30怎么做,
1/2+5/6+11/12+19/20+20/30怎么做,

1/2+5/6+11/12+19/20+20/30怎么做,
1/2+5/6+11/12+19/20+20/30
=(1-1/2)+(1-1/6)+(1-1/12)+(1-1/20)+(1-1/30)
=5-(1/2+1/6+1/12+1/20+1/30)
=5-(1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6)
=5-(1-1/6)
=5-1+1/6
=4又1/6

通分
30/60+50/60+55/60+57/60+/40/60=232/60=58/15

1/2+5/6+11/12+19/20+20/30
=5-(1/2+1/6+1/12+1/20+1/30)
=5-(1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6)
=5-(1-1/6)
=4又1/6