A.=1,b=1 | B. | C. | D. |
A.=1,b=1 | B. | C. | D. |
A.30x+50(700-x)=29000 | B.50x+30(700-x)=29000 |
C.30x+50(700+x)=29000 | D.50x+30(700+x)="29000" |
A.30x+50(700-x)=29000 | B.50x+30(700-x)=29000 |
C.30x+50(700+x)=29000 | D.50x+30(700+x)="29000" |
A.1 | B. 2 | C. -1 | D.-2 |
A.1 | B. 2 | C. -1 | D.-2 |
© 2017-2019 超级试练试题库,All Rights Reserved.