已知x=y=11,求(xy-1)2+(x+y-2)×(x+y-2xy)的值为( ) A.9998 B.9999 C.10 000 D.10 001
问题描述:
已知x=y=11,求(xy-1)2+(x+y-2)×(x+y-2xy)的值为( )
A. 9998
B. 9999
C. 10 000
D. 10 001
答
由于x=y,所以先化简原式,
原式=(x2-1)2+(2x-2)(2x-2x2),
=(x-1)2(x+1)2+4x(x-1)(1-x),
=100×144-44×10×10,
=10 000.
故选C.