问题
解答题
已知x=
|
答案
∵x=
=5+2(
+3
)22 (
-3
)(2
+3
)2
,y=6
=5-2(
-3
)22 (
-3
)(2
+3
)2
,6
∴x+y=10,xy=25-24=1,x-y=4
,6
∴原式=x(x-y)(x+y) x2y(x2+2xy+y2)
=(x-y)(x+y) xy(x+y)2
=x-y xy(x+y)
=4 6 1×10
=
.2 6 5