已知A=3x+2y^2,B=x^2-2x-y^2,若|x+2|+|y-√2|^2=0,求A-B的值.

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已知A=3x+2y^2,B=x^2-2x-y^2,若|x+2|+|y-√2|^2=0,求A-B的值.已知A=3x+2y^2,B=x^2-2x-y^2,若|x+2|+|y-√2|^2=0,求A-B的值.

已知A=3x+2y^2,B=x^2-2x-y^2,若|x+2|+|y-√2|^2=0,求A-B的值.
已知A=3x+2y^2,B=x^2-2x-y^2,若|x+2|+|y-√2|^2=0,求A-B的值.

已知A=3x+2y^2,B=x^2-2x-y^2,若|x+2|+|y-√2|^2=0,求A-B的值.

∵/x+2/+/y-√2/²=0
∴x+2=0,y-√2=0
∴x=-2,y=√2
A-B
=(3x+2y²)-(x²-2x-y²)
=3x+2x-x²+(2y²+y²)
=-x²+5x+3y²
=-(-2)²+5×(-2)+3×(√2)²
=-4-10+6
=-8

|x+2|+|y-√2|^2=0
则x+2=0,y-√2=0
x=-2,y=√2
A=3x(-2)+2x2=-2
B=4-4-2=-2
A-B=-2+2=0

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