They _________ two free tickets to Canada, otherwise they'd never have been able to afford to go．

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A：had got

B：got

C：have got

D：get

上一题下一题 0.0难度选择题更新时间:2018-08-08 05:39:43

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B

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如图，已知△ABC的面积S_△ABC=1.

在图（1）中，若 $\frac{A A_{1}}{A B} = \frac{B B_{1}}{B C} = \frac{C C_{1}}{C A} = \frac{1}{2}$ , 则 $S_{△ A_{1} B_{1} C_{1}} = \frac{1}{4}$ ;
在图（2）中，若 $\frac{A A_{2}}{A B} = \frac{B B_{2}}{B C} = \frac{C C_{2}}{C A} = \frac{1}{3}$ , 则 $S_{△ A_{2} B_{2} C_{2}} = \frac{1}{3}$ ;
在图（3）中，若 $\frac{A A_{3}}{A B} = \frac{B B_{3}}{B C} = \frac{C C_{3}}{C A} = \frac{1}{4}$ , 则 $S_{△ A_{3} B_{3} C_{3}} = \frac{7}{16}$ ;
按此规律，若 $\frac{A A_{4}}{A B} = \frac{B B_{4}}{B C} = \frac{C C_{4}}{C A} = \frac{1}{5}$ , 则 $S_{△ A_{4} B_{4} C_{4}} =$
若 $\frac{A A_{8}}{A B} = \frac{B B_{8}}{B C} = \frac{C C_{8}}{C A} = \frac{1}{9}$ , 则 $S_{△ A_{8} B_{8} C_{8}} =$ .

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