已知1/2x3=1/2-1/3,1/3x4=1/3-1/4,.计算1/2x3+1/3x4+1/4x5+1/5x6.
问题描述:
已知1/2x3=1/2-1/3,1/3x4=1/3-1/4,.计算1/2x3+1/3x4+1/4x5+1/5x6.
答
1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6=1/2-1/6=1/3
答
5/6
就是1-1/6
答
1/2x3+1/3x4+1/4x5+1/5x6
=1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6
=1/2-1/6
=1/3