(2a^2-7a+2)-(a^2-6a+1)
=a^2-a+1
=(a-1/2)^2+3/4
∵(a-1/2)^2>=0
∴(a-1/2)^2+3/4>0
∴2a^2-7a+2>a^2-6a+1
望采納
作差方法比較兩個(gè)代數(shù)式得大?。?a方-7a+2和a方-6a+1
作差方法比較兩個(gè)代數(shù)式得大?。?a方-7a+2和a方-6a+1
數(shù)學(xué)人氣:164 ℃時(shí)間:2020-01-25 22:00:51
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