初二因式分解.
1个回答
2016-12-27
展开全部
(1-1/2²)(1-1/3²)(1-1/4²)……(1-1/2017²)
=[(1-1/2)(1+1/2)][(1-1/3)(1+1/3)][(1-1/4)(1+1/4)]……[(1-1/2017)(1+1/2017)]
=1/2×3/2×2/3×4/3×3/4×5/4×……×2016/2017×2018/2017
=1/2×2018/2017
=1009/2017
=[(1-1/2)(1+1/2)][(1-1/3)(1+1/3)][(1-1/4)(1+1/4)]……[(1-1/2017)(1+1/2017)]
=1/2×3/2×2/3×4/3×3/4×5/4×……×2016/2017×2018/2017
=1/2×2018/2017
=1009/2017
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