1/2+1/6+1/12+1/20+1/30=简算13/5*8*8/13*125简算
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![1/2+1/6+1/12+1/20+1/30=简算13/5*8*8/13*125简算](/uploads/image/z/14154027-51-7.jpg?t=1%2F2%2B1%2F6%2B1%2F12%2B1%2F20%2B1%2F30%3D%E7%AE%80%E7%AE%9713%2F5%2A8%2A8%2F13%2A125%E7%AE%80%E7%AE%97)
1/2+1/6+1/12+1/20+1/30=简算13/5*8*8/13*125简算
1/2+1/6+1/12+1/20+1/30=简算
13/5*8*8/13*125简算
1/2+1/6+1/12+1/20+1/30=简算13/5*8*8/13*125简算
1/2+1/6+1/12+1/20+1/30
=300/600+100/600+50/600+30/600+20/600
=400/600
2/3
13/5*8*8/13*128
=13/5*8/13*8*125
=5/8*1000
=1600
<30+10+5+3+2>/60=50/60=5/6
13/5*8*8/13*125=1/5*8*8*125=8*8*25=8*200=1600
1/2+1/6+1/12+1/20+1/30
=300/600+100/600+50/600+30/600+20/600
=400/600