(a-3)^2+(3b+1)^2=0求(a+b)(a-b)-(a+b)^2-2b^2 化简求值
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(a-3)^2+(3b+1)^2=0求(a+b)(a-b)-(a+b)^2-2b^2 化简求值
(a-3)^2+(3b+1)^2=0求(a+b)(a-b)-(a+b)^2-2b^2 化简求值
(a-3)^2+(3b+1)^2=0求(a+b)(a-b)-(a+b)^2-2b^2 化简求值
∵(a-3)^2+(3b+1)^2=0
两项值均为非负,和为0,则均是0
∴a-3=0,3b+1=0
∴a=3,b=-1/3
∴(a+b)(a-b)-(a+b)^2-2b^2
=a²-b²-(a²+2ab+b²)-2b²
=a²-3b²-a²-2ab-b²
=-4b²-2ab
将a=3,b=-1/3代入
原式=-4*1/9-2*3*(-1/3)=14/9
原式=-4*1/9-2*3*(-1/3)=14/9