— What is 16 ____ 4?
— It's 4. 2 ____ 2 is also 4.
A:divided by; multiplied by
B:plus; multiplied by
C:divided by; minus
D:minus; plus
圆x2+y2﹣2x﹣8y+13=0的圆心到直线ax+y﹣1=0的距离为1,则a=( )
did you get there?
一By train.