二次根式,先化简再求值
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二次根式,先化简再求值二次根式,先化简再求值 二次根式,先化简再求值原式=2/(a-1)+(a-2)平方/(a-1)(a+1)×(a+1)/(a-2)=2/(a-1)+(a-2)/(a-1)
二次根式,先化简再求值
二次根式,先化简再求值
二次根式,先化简再求值
原式=2/(a-1)+(a-2)平方/(a-1)(a+1)×(a+1)/(a-2)
=2/(a-1)+(a-2)/(a-1)
=a/(a-1)
=(1+√2)/(1+√2-1)
=(1+√2)/√2
=√2/2 +1
9.
原式=(x-y)(x+y)/(x-y)=x+y=1+2√3+1-2√3=2
等于x+Y=2
简单