1.2/1+6/1+12/1+20/1+30/1+42/1 2.6/1+12/1+20/1+30/1.+9900/1
问题描述:
1.2/1+6/1+12/1+20/1+30/1+42/1 2.6/1+12/1+20/1+30/1.+9900/1
答
原式=(1-1/2)+(1/2-1/3)+(1/3-1/4)+...+(1/99-1/100)
=1-1/100
=99/100
答
1.2/1+6/1+12/1+20/1+30/1+42/1 2.6/1+12/1+20/1+30/1.+9900/1
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+...+(1/99-1/100)
=1-1/100
=99/100