A:Let’s drive to my house.
B:Here we are.
C:Would you like to see my house?
D:My house is behind the hill.
一台织布机6小时织布93米,照这样计算,…共织布多少米?若正确列式为93÷6×(6+2.5),应补的条件是( )
玲玲有个愿望:骑骆驼欣赏沙漠风光,游览尼罗河,参观金字塔。玲玲最理想的去处是 ( )
计算
80×1.25×4.3-4.3=____
如图所示,已知x2a2+y2b2=1(a>>0)点A(1,2)是离心率为22的椭圆C:上的一点,斜率为2的直线BD交椭圆C于B、D两点,且A、B、D三点不重合.
(Ⅰ)求椭圆C的方程;
(Ⅱ)求△ABD面积的最大值;
(Ⅲ)设直线AB、AD的斜率分别为k1,k2,试问:是否存在实数λ,使得k1+λk2=0成立?若存在,求出λ的值;否则说明理由.
Can you stand on the s____ of the planet Mars without wearing special boots?