丿Smile丶沫 ,
1/42+1/56+1/72+1/90+1/110+1/132
=(1/6-1/7)+(1/7-1/8)+(1/8-1/9)+(1/10-1/11)+(1/11-1/12)
=1/6-1/12
=1/12
数学题1/42+1/56+1/78+1/90+1/110+1/132计算过程、得数!
6个回答
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