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0.09a^2+0.6a+1=(0.3a)的平方+2*0.3a+1=(0.3a+1)的平方(完全平管道) a^2-4/3ab+b^2=a^2-2ab+1/4ab+b^2=a^2-2ab+b^2+1/4ab=(a-b)的平方+1/4ab(配方)
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