1.x=$\sqrt{3}$+1,y=$\sqrt{3}$-1,则(1+$\frac{1}{y}$)(1-$\frac{1}{x}$)=( )
| A. | $4\sqrt{3}$ | B. | $\sqrt{3}$ | C. | $2\sqrt{3}$ | D. | $\frac{3}{2}$ |
19.若${({2+y})^2}+\sqrt{x+y-1}=0$,则xy的值等于( )
0 284833 284841 284847 284851 284857 284859 284863 284869 284871 284877 284883 284887 284889 284893 284899 284901 284907 284911 284913 284917 284919 284923 284925 284927 284928 284929 284931 284932 284933 284935 284937 284941 284943 284947 284949 284953 284959 284961 284967 284971 284973 284977 284983 284989 284991 284997 285001 285003 285009 285013 285019 285027 366461
| A. | -6 | B. | -2 | C. | 2 | D. | 6 |