14.若方程组$\left\{\begin{array}{l}{2a-3b=m}\\{3a+5b=n}\end{array}\right.$的解是$\left\{\begin{array}{l}{a=8.3}\\{b=1.2}\end{array}\right.$,则方程组$\left\{\begin{array}{l}{2(x-1)-3(y+2)=m}\\{3(x-1)+5(y+2)=n}\end{array}\right.$的解是( )
| A. | $\left\{\begin{array}{l}{x=9.3}\\{y=-0.8}\end{array}\right.$ | B. | $\left\{\begin{array}{l}{x=8.3}\\{y=1.2}\end{array}\right.$ | C. | $\left\{\begin{array}{l}{x=7.3}\\{y=3.2}\end{array}\right.$ | D. | $\left\{\begin{array}{l}{x=10.3}\\{y=0.2}\end{array}\right.$ |
13.
如图,一条公路修到湖边时需绕道,第一次拐角∠B=120°,第二次拐角∠C=140°,为了保持公路AB与DE平行,则第三次拐角∠D的度数应为( )
| A. | 130° | B. | 140° | C. | 150° | D. | 160° |
12.学生问老师:“老师,你今年多大了?”,老师风趣地说:“我像你那么大时,你才1岁;你到我这么大时,我已经37岁了.”则老师今年( )
0 297593 297601 297607 297611 297617 297619 297623 297629 297631 297637 297643 297647 297649 297653 297659 297661 297667 297671 297673 297677 297679 297683 297685 297687 297688 297689 297691 297692 297693 297695 297697 297701 297703 297707 297709 297713 297719 297721 297727 297731 297733 297737 297743 297749 297751 297757 297761 297763 297769 297773 297779 297787 366461
| A. | 25岁 | B. | 26岁 | C. | 27岁 | D. | 28岁 |