5(x+y)=5x+5y是___运算,3x²-3x=3x(x-1)是___变形.2009×954+2009×46能被1000整除吗?

问题描述:

5(x+y)=5x+5y是___运算,3x²-3x=3x(x-1)是___变形.
2009×954+2009×46能被1000整除吗?