阅读下列材料:1×2=1/3(1×2×3-0×1×2)2×3=1/3(2×3×4-1×2×3)3×4=1/3(3×4×5-2×3×4)以上三个等式相加,可得1×2+2×3+3×4=1/3×3×4×5=20读完以上材料,请计算下列各题:(1)1×2+2×3+3×4+……+10×11(
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![阅读下列材料:1×2=1/3(1×2×3-0×1×2)2×3=1/3(2×3×4-1×2×3)3×4=1/3(3×4×5-2×3×4)以上三个等式相加,可得1×2+2×3+3×4=1/3×3×4×5=20读完以上材料,请计算下列各题:(1)1×2+2×3+3×4+……+10×11(](/uploads/image/z/1700544-48-4.jpg?t=%E9%98%85%E8%AF%BB%E4%B8%8B%E5%88%97%E6%9D%90%E6%96%99%EF%BC%9A1%C3%972%3D1%2F3%EF%BC%881%C3%972%C3%973-0%C3%971%C3%972%EF%BC%892%C3%973%3D1%2F3%EF%BC%882%C3%973%C3%974-1%C3%972%C3%973%EF%BC%893%C3%974%3D1%2F3%EF%BC%883%C3%974%C3%975-2%C3%973%C3%974%EF%BC%89%E4%BB%A5%E4%B8%8A%E4%B8%89%E4%B8%AA%E7%AD%89%E5%BC%8F%E7%9B%B8%E5%8A%A0%2C%E5%8F%AF%E5%BE%971%C3%972%2B2%C3%973%2B3%C3%974%3D1%2F3%C3%973%C3%974%C3%975%3D20%E8%AF%BB%E5%AE%8C%E4%BB%A5%E4%B8%8A%E6%9D%90%E6%96%99%2C%E8%AF%B7%E8%AE%A1%E7%AE%97%E4%B8%8B%E5%88%97%E5%90%84%E9%A2%98%EF%BC%9A%EF%BC%881%EF%BC%891%C3%972%2B2%C3%973%2B3%C3%974%2B%E2%80%A6%E2%80%A6%2B10%C3%9711%EF%BC%88)
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阅读下列材料:1×2=1/3(1×2×3-0×1×2)2×3=1/3(2×3×4-1×2×3)3×4=1/3(3×4×5-2×3×4)以上三个等式相加,可得1×2+2×3+3×4=1/3×3×4×5=20读完以上材料,请计算下列各题:(1)1×2+2×3+3×4+……+10×11(
阅读下列材料:
1×2=1/3(1×2×3-0×1×2)
2×3=1/3(2×3×4-1×2×3)
3×4=1/3(3×4×5-2×3×4)
以上三个等式相加,可得
1×2+2×3+3×4=1/3×3×4×5=20
读完以上材料,请计算下列各题:
(1)1×2+2×3+3×4+……+10×11
(2)1×2+2×3+3×4+……+n(n+1)
(3)1×2×3+2×3×4+3×4×5+……+7×8×9
阅读下列材料:1×2=1/3(1×2×3-0×1×2)2×3=1/3(2×3×4-1×2×3)3×4=1/3(3×4×5-2×3×4)以上三个等式相加,可得1×2+2×3+3×4=1/3×3×4×5=20读完以上材料,请计算下列各题:(1)1×2+2×3+3×4+……+10×11(
(1)=10*11*12*1/3=440
(2)=n*(n+1)*(n+2)/3
(3)=7*8*9*10/4=1260