①a²+a+1/4②(y²-6)²-6(y²-6)+9过程!
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①a²+a+1/4②(y²-6)²-6(y²-6)+9过程!
①a²+a+1/4②(y²-6)²-6(y²-6)+9过程!
①a²+a+1/4②(y²-6)²-6(y²-6)+9过程!
答:
①a²+a+1/4
=a²+2*a*(1/2)+(1/2)²
=(a+1/2)²
②(y²-6)²-6(y²-6)+9
=(y²-6-3)²
=(y²-9)²
=(y-3)²(y+3)²
①a²+a+1/4
=(a+1/2)²
②(y²-6)²-6(y²-6)+9
=(y²-6-3)²
=(y²-9)²
=(y+3)²(y-3)²
①a²+a+1/4
=(a+1/2)²
②(y²-6)²-6(y²-6)+9
=[(y²-6)-3]²
=(y²-9)²
=(y+3)²(y-3)²