Question

2乘以3分之一加上3乘以4分之一加到49乘以50分之一等于多少

Answer 1

1/2X3+1/3x4+...+1/49x1/50
=(1/2-1/3)+(1/3-1/4)+...+(1/49-1/50)
=1/2-1/50
=12/25