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- 1在矩形ABCD中,BC=4,BG与对角线AC垂直且分别交AC,AD及射线CD于点E,F,G,AB=x. (1)当点G与点D重合时,求x的值; (2)当点F为AD中点时,求x的值及∠ECF的正弦值.
- 2英汉互译:You've gone too far.
- 3一个数的立方等于它本身,这个数是?A:0 B:1 C:-1,1 D:-1,1,0
- 4Only __ English doer not mean__ the language.
- 5It’s about…minutes’walk/ride 这句话的表达方式怎么是这样的?还有minutes'walk和minutes'ride吗?
- 6设 F1、F2是双曲线x24−y2=1的两个焦点,点P在双曲线上,且∠F1PF2=90°,则△F1PF2的面积为( ) A.5 B.2 C.52 D.1
- 7belive me please .i will given u happy.中文意思?
- 8It is ___ to run into the danger for nothing.
- 91/(2^n+1)求和.怎么做.在线等.急等
- 10翻译Please make sure that all the lights are turned off before you leave the classroom.