It's utterly absurb. 2.I'm all in a sweat with the heat. 3.Many tall buildings, big mansions, hotels and guest houses have been built recently. 4.It is interesting that you should like him. 5.It took us five years to complete the project.
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【简答题】如图所示,F为双曲线C: x 2 9 - y 2 16 =1 的左焦点,双曲线C上的点P i 与P 7-i (i=1,2,3)关于y轴对称,则|P 1 F|+|P 2 F|+|P 3 F|-|P 4 F|-|P 5 F|-|P 6 F|的值是______.