1/1*2+1/2*3+1/3*4+.+1/49*50
2个回答
1/1*2+1/2*3+1/3*4+…+1/49*50
=1-1/2+1/2-1/3+.+1/48-1/49+1/49-1/50
=1-1/50
=49/50
相关问题
1+1/2+〔1/3+2/3〕+〔1/4+2/4+3/4〕+…+〔1/50+2/50+…49/50〕
1/2+1/3+2/3+1/4+2/4+3/4+.+1/50+2/50+3/50+...+49/50
1+2+3+4…………+49+50+49…+4+3+2+1=?
1/2+(1/2+1/3)+(1/4+2/4+3/4)+...+(1/50+2/50+3/50+...+48/50+49
1/2+1/3+2/3+1/4+2/4+3/4...+1/50+2/50+...48/50+49/50=?
1/2+1/3+2/3+1/4……+49/50
1/1*2+1/2*3+1/3*4+…+1/49*50=?
1/2+(1/3+2/3)+(1/4+2/4+3/4)+.(1/50+2/50+3/50+.+49/50)的简便运算
1*1/2+1/2*1/3+1/3*1/4+.1/48*1/49+1/49*1/50
求简算:1/2+(1/2+1/3)+(1/4+2/4+3/4)+…+(1/50+2/50+3/50+…+48/50+49