From the window we can see the blue sky and green trees .and it is good for our eyes.中文
From the window we can see the blue sky and green trees .and it is good for our eyes.中文
英語(yǔ)人氣：183 ℃時(shí)間：2020-01-25 23:49:41
優(yōu)質(zhì)解答
從窗戶那我們可看到藍(lán)天綠樹(shù),而這有助于保眼已知：a=x的平方-2x-1，b=2x的平方-6x+3，求3a-【（2a-b）-2（a-b）】的值，其中x等于-717
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