1⼀2乘4+1⼀4乘6+1⼀6乘8+......+1⼀2010乘2012.要过程

2024-12-28 05:45:21
推荐回答(2个)
回答1:

解:
原式=(1/2)*[2/(2*4)+2/(4*6)+2/(6*8)+……+2/(2010*2012)]
=(1/2)*[(1/2-1/4)+(1/4-1/6)+(1/6-1/8)+……+(1/2010-1/2012)]
=(1/2)*[1/2-1/2012]
=1005/4024

回答2:

1/2乘4+1/4乘6+1/6乘8+......+1/2010乘2012
=1/2(1/2-4/1+1/4-1/6+1/6-1/8……+1/2012-1/2012) 注:1/(2x4)=1/2(1/2-1/4)
=1/2(1/2-1/2012)
=1/2 x 1005/2012
=1005/4024