先化簡(jiǎn),后求值【(x-y)的平方+(x+y)(x-y)】/X,其中x=-1,y=1/2
先化簡(jiǎn),后求值【(x-y)的平方+(x+y)(x-y)】/X,其中x=-1,y=1/2
其他人氣:696 ℃時(shí)間:2020-04-14 01:29:40
優(yōu)質(zhì)解答
=【(x-y)(x-y+x+y)】/x =(x+y)*2x/x =2x+2y 當(dāng)x=-1,y=1/2時(shí) 原式=-1*2+1/2*2 =-2+1 =-1
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