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(1+1×3分之1)×(1+2×4分之1)×(1+3×5分之1)…(1+9×11分之1)
=[4/(1x3)]*[9/(2x4)]*[16/(3x5)]*...*[100/(9x11)]
=(4x9x16x25x36x....x100)/(1x3x2x4x3x5....x8x10x9x11)
=(2x2x3x3x....x10x10)/(1x2x3x3x4....x9x9x10x11)
=(2x2x10x10)/(1x2x10x11)
=20/11
=[4/(1x3)]*[9/(2x4)]*[16/(3x5)]*...*[100/(9x11)]
=(4x9x16x25x36x....x100)/(1x3x2x4x3x5....x8x10x9x11)
=(2x2x3x3x....x10x10)/(1x2x3x3x4....x9x9x10x11)
=(2x2x10x10)/(1x2x10x11)
=20/11
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