来自李阳春的问题
【计算:1/3*4+1/4*5+1/5*6+1/6*7+1/7*8+1/8*9】
计算:1/3*4+1/4*5+1/5*6+1/6*7+1/7*8+1/8*9
1回答
2020-05-14 23:11
【计算:1/3*4+1/4*5+1/5*6+1/6*7+1/7*8+1/8*9】
计算:1/3*4+1/4*5+1/5*6+1/6*7+1/7*8+1/8*9
1/3*4+1/4*5+1/5*6+1/6*7+1/7*8+1/8*9
=1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8+1/8-1/9
=1/3-1/9
=2/9