x²+2x+5
=(x+1)^2+4
=2011+4
=2015
已知x=根号下2011根号外再-1,求代数式x²+2x+5的值、
已知x=根号下2011根号外再-1,求代数式x²+2x+5的值、
数学人气:394 ℃时间:2019-10-18 17:28:51
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