计算2分之1+6分之1+12分之1+20分之1+······+90分之1

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计算2分之1+6分之1+12分之1+20分之1+······+90分之1

计算2分之1+6分之1+12分之1+20分之1+······+90分之1
计算2分之1+6分之1+12分之1+20分之1+······+90分之1

计算2分之1+6分之1+12分之1+20分之1+······+90分之1
2分之1+6分之1+12分之1+20分之1+······+90分之1
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+……+1/9-1/10
=1-1/10
=9/10

2分之1+6分之1+12分之1+20分之1+······+90分之1
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+……+1/9-1/10
=1-1/10
=9/10

=1/2+1/2-1/3+1/3-1/4+1/4-1/5+....-1/9+1/10
=1+1/10
=11/10

1/2+1/6+1/12+1/20+……+1/90
=1/(1x2)+1/(2x3)+1/(3x4)+1/(4x5)+……+1/(9x10)
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4+1/5)+……+(1/9-1/10)
=1-1/10
=9/10

1/2+1/6+1/12+1/20+······1/90
=1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+······1/(9*10)
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+······+1/9-1/10
=1-1/10
=9/10

2分之1+6分之1+12分之1+20分之1+······+90分之1
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+……+1/9-1/10
=1-1/10
=9/10