有23个△,平均分成4份,每份有____个,还剩____个.
____÷____=____(个)……____ (个)
(Ⅰ)若直线l和曲线C有公共点,求倾斜角α的取值范围;
(Ⅱ)设B(x,y)为曲线C任意一点,求 3x+y 的取值范围.
I'm looking _____my book. Where is it?