直角坐标系内的点P(x2﹣3x,4)与另一点Q(x﹣8,y)关于原点对称,试求2014(2x﹣y)的值.
解:由题意得:y=﹣4,x2﹣3x=8﹣x,解得:x1=4,x2=﹣2,
当x=4,y=﹣4时,2014(2x﹣y)=2014×(2×4+4)=24168,
当x=﹣2,y=﹣4时,2014(2x﹣y)=2014×(﹣4+4)=0.
东西半球的分界线是( )
下列事件发生的概率为0的是( )
Hi! This is Mr. Li's farm. Let's have a look. There is a vegetable garden. These are carrots and pumpkins. Those are tomatoes and green beans over there. There are animals, too. What's that? It's a cow. How many cows on the farm? He has ten cows on the farm.
根据上面短文的意思判断下面的句子是否正确。