Question

xy满足|x+2|+(y+3)^2=0

若x,y满足|x+2|+(y-3/2)^2=0,求代数式1/2x-2(x-1/3y^2)+(-3/2x+1/3y)的值.

Answer 1

因为|x+2|≥0,(y-3/2)^2≥0,|x+2|+(y-3/2)^2=0∴|x+2|＝0 (y-3/2)^2=0 所以x=-2,y=3/2代入上述代数式即可