题目先化简,再求值:[y2+(x−y)(y+2x)]÷(−2x)[y^{2}+\left(x-y\right)\left(y+2x\right)]\div \left(-2x\right)[y2+(x−y)(y+2x)]÷(−2x),其中实数xxx,yyy满足∣x+3∣+(y−5)2=0|x+3|+\left(y-5\right)^{2}=0∣x+3∣+(y−5)2=0.知识点：去括号与添括号章节：数与式 / 代数式
