--Do you like baseball?
--Yes, I __________. But my father __________.
A:do; don't
B:does; doesn't
C:do; doesn't
D:does; don't
先化简,再求值:(x2)3÷x4﹣(x+2)(x﹣2)+(x+1)2,其中x=﹣ 12 .
如图,AD是△ABC的中线,AE∥BC,BE交AD于点F,且AF=DF.
(1)求证:四边形ADCE是平行四边形;
(2)当AB、AC之间满足 什么时,四边形ADCE是矩形;
(3)当AB、AC之间满足 什么时,四边形ADCE是正方形.