1/2+1/6+1/12+1/20+1/30+1/42+1/56=?(要算式)
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/25 14:37:21
![1/2+1/6+1/12+1/20+1/30+1/42+1/56=?(要算式)](/uploads/image/z/18125-53-5.jpg?t=1%2F2%2B1%2F6%2B1%2F12%2B1%2F20%2B1%2F30%2B1%2F42%2B1%2F56%3D%3F%28%E8%A6%81%E7%AE%97%E5%BC%8F%EF%BC%89)
x0FIp,0 蠢dLu8b
ESPIZ0v|{L{sb$j|S)L
i2-8չ(둆& -
igH\z,ab6p_5S:e}NlRV%[IlG
1/2+1/6+1/12+1/20+1/30+1/42+1/56=?(要算式)
1/2+1/6+1/12+1/20+1/30+1/42+1/56=?(要算式)
1/2+1/6+1/12+1/20+1/30+1/42+1/56=?(要算式)
1/2+1/6+1/12+1/20+1/30+1/42+1/56
=1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+1/(5*6)+1/(6*7)+1/(7*8)
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8
=1-1/8
=7/8
1/2+1/6+1/12+1/20+1/30+1/42+1/56
=1/2+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)+(1/7-1/8)
=1/2+1/2-1/8
=7/8