2.为清理积压的库存,商场决定打折销售,已知甲、乙两种服装的原单价共为440元,现将甲服装打八折,乙服装打七五折,结果两种服装的单价共为342元,则甲、乙两种服装的原单价分别是( )
| A. | 200元,240元 | B. | 240元,200元 | C. | 280元,160元 | D. | 160元,280元 |
17.若把x2+2x-2=0化为(x+m)2+k=0的形式(m,k为常数),则m+k的值为( )
0 297815 297823 297829 297833 297839 297841 297845 297851 297853 297859 297865 297869 297871 297875 297881 297883 297889 297893 297895 297899 297901 297905 297907 297909 297910 297911 297913 297914 297915 297917 297919 297923 297925 297929 297931 297935 297941 297943 297949 297953 297955 297959 297965 297971 297973 297979 297983 297985 297991 297995 298001 298009 366461
| A. | -2 | B. | -4 | C. | 2 | D. | 4 |