x+y+(根号下x方+y方)=2 化简xy=2(x+y)-2?
问题描述:
x+y+(根号下x方+y方)=2 化简xy=2(x+y)-2?
答
X+Y+(根号下x方+y方)=2
(根号下x方+y方)=2-(X+Y)
x方+y方=4+(X+Y)方-4(X+Y)
XY=2(X+Y)-2