选择单词,补全短文
hot China winter people old east
Shanghai is the biggest city in ____.It's in the ____ of China. It's got a lot of ____.It's an ____ city. It's very ____ in summer and it's cold in ____.
如图,下列判断:①∠A与∠1是同位角;②∠A与∠B是同旁内角;③∠1与∠4是内错角;④∠1与∠3是同位角. 其中正确的个数是
已知m+n=mn,则(m﹣1)(n﹣1)=____ .
分解因式:ma+mb=____.
掷一个骰子,向上一面的点数大于2且小于5的概率为p1,抛两枚硬币,两枚硬币都正面朝上的概率为p2,则( )