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1*2+2*3+……+100*101=?1*2+2*3+3*4+……+n*(n+1)=?1*2*3+2*3*4+……+n
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相关问题
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(1) 1*2+2*3+...+100*101=? (2)1*2+2*3+3*4+...+n(n+1)=? (3)1*2
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现在急需的数学计算~~~⑴1*2+2*3+3*4+……+100*101=⑵1*2+2*3+3*4+……+n(n+1)=⑶
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