0.9×7+2.7=____
1.5×8×2=____
0×3.15+3.1=____
9.4-2.8×3=____
已知椭圆的参数方程 (t为参数)点M、N在椭圆上,对应参数分别为 , ,则直线MN的斜率为____。
— Would you like some juice?
— ________. I'd like something to eat.