(1) (-1)^2011-|-7|+根号9*(根号5-派)^0+(5分之1)^-1(2) a-1分之2a+1除以(a+1)-a^2-2a+1分之a^2-1要全部计算过程!写对一题不追分,对两题追10分.
问题描述:
(1) (-1)^2011-|-7|+根号9*(根号5-派)^0+(5分之1)^-1
(2) a-1分之2a+1除以(a+1)-a^2-2a+1分之a^2-1
要全部计算过程!
写对一题不追分,对两题追10分.
答
(1)
=-1-7+3*1+5=0
(2)
[(2a+1)/(a-1)]/(a+1)-(a²-1)/(a²-2a+1)
=(2a+1)/(a-1)(a+1)-[(a-1)(a+1)]/(a-1)²
=(2a+1)/(a-1)(a+1)-(a+1)/(a-1)
=(2a+1-a²-2a-1)/(a²-1)=a²/(1-a)