根据下列各组x、y的值,分别求出代数式x2+2xy+y2与x2-2xy+y2的值:(1)x=2,y=3; (2)x、根据下列各组x、y的值,分别求出代数式x2+2xy+y2与x2-2xy+y2的值.(1)、x=2,y=3,(2)、x= -2,y= -4
问题描述:
根据下列各组x、y的值,分别求出代数式x2+2xy+y2与x2-2xy+y2的值:(1)x=2,y=3; (2)x
、根据下列各组x、y的值,分别求出代数式x2+2xy+y2与x2-2xy+y2的值.
(1)、x=2,y=3,(2)、x= -2,y= -4
答
(1)x2+2xy+y2=2*2+2*2*3+2*3=20
(2)x2+2xy+y2=-2*2+2*-2*-4+2*-4=4
(1)x2-2xy+y2=2*2-2*2*3+2*3=-2
(2)x2-2xy+y2=-2*2-2*-2*-4+2*-4=-28