A:located
B:locating
C:to locate
D:locate
It is necessary for everyone to ____ a good habit of reading.
如果点P(m,1﹣2m)在第四象限,那么m的取值范围是____
对于任意x,x表示不超过x的最大整数,如1.1=1,﹣2.1=﹣3.定义R上的函数f(x)=2x+4x+8x,若A={y|y=f(x),0≤x≤1},则A中所有元素的和为____ .