1米=100厘米(1)剪去20厘米后还有多少厘米?
100-20=80(厘米)(2)又剪去15厘米后,还剩多少厘米?
80-15=65(厘米)
答:这条绳还剩65厘米.
一物块轻轻放入盛满煤油的大烧杯中,静止后有160g煤油溢出;将其轻轻放入盛满水的大烧杯中,静止后有180g水溢出,已知煤油的密度是 0.8×103kg/m3 ,则物块在水中静止时的状态及物块的密度分别是( )
He _______ computer games when his parents left home. So he didn't know where they were.
已知函数f(x)=log3x,x>02x,x≤0,则ff(19)的值为____