(-x^2-y)^2=（-x²）²-2（-x²）y+y²=x^4+2x²y+y²或者 (-x^2-y)^2=[-(x²+y)]²=(x²+y)²=x^4+2x²y+y²此题-x²应理解为x²的相反数,把x²看做...