1/2+1/6+1/12+1/20+1/30+1/42+1/56简算,
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![1/2+1/6+1/12+1/20+1/30+1/42+1/56简算,](/uploads/image/z/18421-61-1.jpg?t=1%2F2%2B1%2F6%2B1%2F12%2B1%2F20%2B1%2F30%2B1%2F42%2B1%2F56%E7%AE%80%E7%AE%97%2C)
1/2+1/6+1/12+1/20+1/30+1/42+1/56简算,
1/2+1/6+1/12+1/20+1/30+1/42+1/56简算,
1/2+1/6+1/12+1/20+1/30+1/42+1/56简算,
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8
=1-1/8
=7/8