A:(x+2)2=1
B:(x+2)2=19
C:(x+2)2=13
D:(x+2)2=7
点D在椭圆上,AD⊥AB,直线BD与x轴,y轴分别交于M,N.
43×2=____ 18×5=____
320×3=____ 2×460=____