求简便运算过程! 5
1个回答
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(1-1/2²)x(1-1/3²)x(1-1/4²)x……x(1-1/10²)
=(1+1/2)x(1-1/2)x(1+1/3)x(1-1/3)x(1+1/4)x(1-1/4)……x(1+1/10)x(1-1/10)
=(3/2x4/3x5/4x……x11/10)x(1/2x2/3x3/4x……x9/10)
=11/2x1/10
=11/20
(1²-2²)/(1+2)+(3²-4²)/(3+4)+(5²-6²)/(5+6)+……+(2015²-2016²)/(2015+2016)
=-1-1-1-……-1
=-1008
=(1+1/2)x(1-1/2)x(1+1/3)x(1-1/3)x(1+1/4)x(1-1/4)……x(1+1/10)x(1-1/10)
=(3/2x4/3x5/4x……x11/10)x(1/2x2/3x3/4x……x9/10)
=11/2x1/10
=11/20
(1²-2²)/(1+2)+(3²-4²)/(3+4)+(5²-6²)/(5+6)+……+(2015²-2016²)/(2015+2016)
=-1-1-1-……-1
=-1008
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