I got a nice present on my ____ (nine) birthday.
24÷4=____ 54+6=____ 7÷1=____ 56-8=____ 18÷6=____
1÷1=____ 49-7=____ 6×8=____ 5×9=____30÷5=____
—I agree. Because the world is _________all the time.
水平雪地上,穿着雪橇的芳芳总质量为70Kg,没有陷入雪地;而穿着运动鞋的小明总质量为50Kg,却深陷雪地。下列说法正确的是( )
a1= 12 ,a2= 11−a1 ,a3= 11−a2 ,…,an= 11−an−1 (n≥2且n为正整数),则a2017的值为____(结果用数字表示)