不通分,解计算题 1/2+1/6+1/12+1/2 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90

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不通分,解计算题 1/2+1/6+1/12+1/2 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90

不通分,解计算题 1/2+1/6+1/12+1/2 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90
不通分,解计算题 1/2+1/6+1/12+1/2 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90

不通分,解计算题 1/2+1/6+1/12+1/2 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90
=1-1/10
=9/10