|x+3|+(2x+y)^2=0,求4分之3x^2-(3y-4分之1x^2)+y的值

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|x+3|+(2x+y)^2=0,求4分之3x^2-(3y-4分之1x^2)+y的值
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|x+3|+(2x+y)^2=0,求4分之3x^2-(3y-4分之1x^2)+y的值
|x+3|+(2x+y)^2=0,求4分之3x^2-(3y-4分之1x^2)+y的值

|x+3|+(2x+y)^2=0,求4分之3x^2-(3y-4分之1x^2)+y的值
|x+3|≥0,(2x+y)^2≥0,
|x+3|+(2x+y)^2=0,
∴|x+3|=(2x+y)^2=0,
∴x=-3,y=-2x=6
∴3/4x²-(3y-1/4x²)+y = 3/4x²-3y+1/4x²+y = x²-2y = (-3)²-2*6 = -3

x=-3
y=6
代入求解即可

由x+3=0,2x+y=0可求x和y,然后带到后面的式子就可以得到答案了。