对于实数x,y,z,定义运算“*”,满足x*y=6x^2+4xy+y^2-249/(x+1)^2

问题描述:

对于实数x,y,z,定义运算“*”,满足x*y=6x^2+4xy+y^2-249/(x+1)^2
(y+1)^2-57

[(2x+y)^2+3][(y-4)^2+1]=3(2x+y)^2(y-4)^2+3(y-4)^2+(2x+y)^2+3=3(2x+y)^2(y-4)^2+3(y-4)^2+(2x+y)^2=0因为(2x+y)^2(y-4)^2和3(y-4)^2和(2x+y)^2都大于等于0相加等于0所以都等于0所以y-4=0,2x+y=0y=4,x=-2x+y=2...