1*2/1+2*3/1+3*4/1+.2011*2012/1之和等于多少啦
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1*2/1+2*3/1+3*4/1+.2011*2012/1之和等于多少啦
1*2/1+2*3/1+3*4/1+.2011*2012/1之和等于多少啦
1*2/1+2*3/1+3*4/1+.2011*2012/1之和等于多少啦
1/1*2+1/2*3+1/3*4+.+1/2011*2012
=1-1/2+1/2-1/3+1/3-1/4+.+1/2011-1/2012
=1-1/2012
=2011/2012
1*2/1+2*3/1+3*4/1+......2011*2012/1
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+...+(1/2011-1/2012)
=1-1/2012
=2011/2012
1*2/1+2*3/1+3*4/1+......2011*2012/1
反一个身
1/1*2+1/2*3+1/3*4+1/4*5+……+1/2011*2012
=1-1/2+1/2-1/3+1/3-1/4+1/4+……-1/2011+1/2011-1/2012
=1-1/2012
=2011/2012