(1-1/2的平方)(1-1/3的平方)…(1-1/100)
=(1+1/2)(1-1/2)(1+1/3)(1-1/3)……(1+1/100)(1-1/100)
=3/2×4/3×……×101/100×1/2×2/3×……×99/100
=101/2×1/100
=101/200
我是初来者(1-1/2的平方)(1-1/3的平方)…(1-1/100)
=(1+1/2)(1-1/2)(1+1/3)(1-1/3)……(1+1/100)(1-1/100)
=3/2×4/3×……×101/100×1/2×2/3×……×99/100
=101/2×1/100
=101/200
结论:1-(1/a)的平方的差=(a-1)/a的平方=(a-1)/a*(a+1)/a
1-1/100的平方=9999/10000=99/100*101/100
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