(mn+2)(mn-2)-(m-n)^2,其中m=2,n=0.已知A+B=1,A-B=-3,求a^2+3ab+b^2
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![(mn+2)(mn-2)-(m-n)^2,其中m=2,n=0.已知A+B=1,A-B=-3,求a^2+3ab+b^2](/uploads/image/z/4369368-48-8.jpg?t=%28mn%2B2%29%28mn-2%29-%28m-n%29%5E2%2C%E5%85%B6%E4%B8%ADm%3D2%2Cn%3D0.%E5%B7%B2%E7%9F%A5A%2BB%3D1%2CA-B%3D-3%2C%E6%B1%82a%5E2%2B3ab%2Bb%5E2)
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(mn+2)(mn-2)-(m-n)^2,其中m=2,n=0.已知A+B=1,A-B=-3,求a^2+3ab+b^2
(mn+2)(mn-2)-(m-n)^2,其中m=2,n=0.
已知A+B=1,A-B=-3,求a^2+3ab+b^2
(mn+2)(mn-2)-(m-n)^2,其中m=2,n=0.已知A+B=1,A-B=-3,求a^2+3ab+b^2
就是(a+b)+ab 1+ab (a+b)-(a-b)=4ab (a+b)-(a-b)=10 ab=2.5 (a+b)+ab=3.5
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