观察下面3组算式,发现规律并填空.1×2=3分之2×3,1×2+2×3=3分之2×3×4 ,1×2+2×3+3×4=3分之3×4×5(1)1×2+2×3+3×4+4×5=3分之4×5×()(2)1×2+2×3+3×4+4×5+5×6=()分之()×()×()(3)1×2+2×
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![观察下面3组算式,发现规律并填空.1×2=3分之2×3,1×2+2×3=3分之2×3×4 ,1×2+2×3+3×4=3分之3×4×5(1)1×2+2×3+3×4+4×5=3分之4×5×()(2)1×2+2×3+3×4+4×5+5×6=()分之()×()×()(3)1×2+2×](/uploads/image/z/1081238-14-8.jpg?t=%E8%A7%82%E5%AF%9F%E4%B8%8B%E9%9D%A23%E7%BB%84%E7%AE%97%E5%BC%8F%2C%E5%8F%91%E7%8E%B0%E8%A7%84%E5%BE%8B%E5%B9%B6%E5%A1%AB%E7%A9%BA.1%C3%972%3D3%E5%88%86%E4%B9%8B2%C3%973%2C1%C3%972%EF%BC%8B2%C3%973%3D3%E5%88%86%E4%B9%8B2%C3%973%C3%974+%2C1%C3%972%EF%BC%8B2%C3%973%EF%BC%8B3%C3%974%3D3%E5%88%86%E4%B9%8B3%C3%974%C3%975%EF%BC%881%EF%BC%891%C3%972%2B2%C3%973%2B3%C3%974%2B4%C3%975%3D3%E5%88%86%E4%B9%8B4%C3%975%C3%97%EF%BC%88%EF%BC%89%EF%BC%882%EF%BC%891%C3%972%2B2%C3%973%2B3%C3%974%2B4%C3%975%2B5%C3%976%3D%EF%BC%88%EF%BC%89%E5%88%86%E4%B9%8B%EF%BC%88%EF%BC%89%C3%97%EF%BC%88%EF%BC%89%C3%97%EF%BC%88%EF%BC%89%EF%BC%883%EF%BC%891%C3%972%2B2%C3%97)
观察下面3组算式,发现规律并填空.1×2=3分之2×3,1×2+2×3=3分之2×3×4 ,1×2+2×3+3×4=3分之3×4×5(1)1×2+2×3+3×4+4×5=3分之4×5×()(2)1×2+2×3+3×4+4×5+5×6=()分之()×()×()(3)1×2+2×
观察下面3组算式,发现规律并填空.
1×2=3分之2×3,1×2+2×3=3分之2×3×4 ,1×2+2×3+3×4=3分之3×4×5
(1)1×2+2×3+3×4+4×5=3分之4×5×()
(2)1×2+2×3+3×4+4×5+5×6=()分之()×()×()
(3)1×2+2×3+3×4+…+n×(n+1)=()分之()×()×()
(4)199×200分之1×(1×2+2×3+3×4+…+199×200)=(这部需要写过程)
观察下面3组算式,发现规律并填空.1×2=3分之2×3,1×2+2×3=3分之2×3×4 ,1×2+2×3+3×4=3分之3×4×5(1)1×2+2×3+3×4+4×5=3分之4×5×()(2)1×2+2×3+3×4+4×5+5×6=()分之()×()×()(3)1×2+2×
1×2=3分之2×3,1×2+2×3=3分之2×3×4 ,1×2+2×3+3×4=3分之3×4×5
(1)1×2+2×3+3×4+4×5=3分之4×5×()
(2)1×2+2×3+3×4+4×5+5×6=()分之()×()×()
(3)1×2+2×3+3×4+…+n×(n+1)=()分之()×()×()
(4)199×200分之1×(1×2+2×3+3×4+…+199×200)=(这部需要写过程)
(1)1×2+2×3+3×4+4×5=3分之4×5×(6)
(2)1×2+2×3+3×4+4×5+5×6=(3)分之(5)×(6)×(7)
(3)1×2+2×3+3×4+…+n×(n+1)=(3)分之(n)×(n+1)×(n+2)
(4)199×200分之1×(1×2+2×3+3×4+…+199×200)=199X199X200X201/(200X3)=199X199X67
(1)1×2+2×3+3×4+4×5=3之4×5×(6);
(2)1×2+2×3+3×4+4×5+5×6=(3)分之(5)×(6)×(7);
(3)1×2+2×3+3×4+…+n×(n+1)=(3)分之(n)×(n+1)×(n+2);
(4)(199×200)分之1×(1×2+2×3+3×4+…+199×200)
=(199×200)分之[1×3分之...
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(1)1×2+2×3+3×4+4×5=3之4×5×(6);
(2)1×2+2×3+3×4+4×5+5×6=(3)分之(5)×(6)×(7);
(3)1×2+2×3+3×4+…+n×(n+1)=(3)分之(n)×(n+1)×(n+2);
(4)(199×200)分之1×(1×2+2×3+3×4+…+199×200)
=(199×200)分之[1×3分之(199×200×201)]=3分之201=67.
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(1)1×2+2×3+3×4+4×5=3分之4×5×(6)
(2)1×2+2×3+3×4+4×5+5×6=(3)分之(5)×(6)×(7)
(3)1×2+2×3+3×4+…+n×(n+1)=(3)分之(n)×(n+1)×(n+2)
(4)199×200分之1×(1×2+2×3+3×4+…+199×200)=199×200分之1×3分之199×200×201=3分之201=67