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1x2+1x3x4+1x3x5x6+⋯+1x3x5x7x9x11x13x14
算一算,1x2x3x4+1,2x3x4x5+1,3x4x5x6+1,4x5x6x7+1之间有什么规律,并求出11x12x13x14+1的值
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其他回答
第1个回答 2020-07-10
1×2×3×4+1=(2×3-1)^2=5^2. 2×3×4×5+1=(3×4-1)^2=11^2. 3×4×5×6+1=(4×6-1)^2=19^2. 4×5×6×7+1=(5×6-1)^2=29^2 即等于每式第二第三项相乘减一 所以11×12×13×14+1=(12×13-1)^2=155^2=24025
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