请选择ABC2l'O'q+B0r7f3m0?8b 计算带有括号的四则混合运算时,要先算__________ ,再算__________ 。+f,n:\0u3V(h)V9@(i,p
A,乘除,加减,+f,n:\0u3V(h)V9@(i,p
B乘除,括号内,+f,n:\0u3V(h)V9@(i,p
C括号内的,括号外的+f,n:\0u3V(h)V9@(i,p