计算:(-a-b)^2-(1/4a-2/3b)^2

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计算:(-a-b)^2-(1/4a-2/3b)^2计算:(-a-b)^2-(1/4a-2/3b)^2计算:(-a-b)^2-(1/4a-2/3b)^2(-a-b)^2-(1/4a-2/3b)^2=a^

计算:(-a-b)^2-(1/4a-2/3b)^2
计算:(-a-b)^2-(1/4a-2/3b)^2

计算:(-a-b)^2-(1/4a-2/3b)^2
(-a-b)^2-(1/4a-2/3b)^2
=a^2-2ab+b^2-1/16a^2+1/3ab-4/9b^2
=15/16a^2-5/3ab+5/9b^2