因式分(x+y)2-3(x+y)=______.
(x+y)2-3(x+y)=(x+y)(x+y-3).
已知点A(a,2)是点B(3,b)关于原点O的对称点,求出a+b的值是______.
In relation to the formation of a company explain:
(a) the role and duties of promoters, and how they are regulated; (5 marks)