选出一个最佳选项( )
A:Thursday.
B:Friday
C:Saturday
San Francisco is a city in America. ( )
先去括号,再合并同类项
(1)2(2b﹣3a)+3(2a﹣3b)
(2)4a2+2(3ab﹣2a2)﹣(7ab﹣1)