A:①②
B:②④
C:①③
D:③④
- Have you got a pet? ( )
- _________.
脱式计算.
(0.62+0.46)÷5.4
已知P为直线y=kx+b上一动点,若点P与原点均在直线x﹣y+2=0的同侧,则k,b满足的条件分别为( )