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-3/8
我們把(x+1)看作是一個未知數y,原方程8(x+1)²;-3(x+1)+2=0將變為8y^2-3y+2 = 0 y將無實數解.原方程是否也無解呢,我們將原方程化為標準形式 8x^2 +13x + 7= 0 △=13^2 - 4*8*7 < 0 方程無實數解.
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