解:372-103原式=372-(100+3) =372-100-3 =272-3 =269
372-103的简便计算=372-100-3=272-3=269
372-103=372-(100+3)=372-100-3=272-3=269
=372-(100+3)=372-100-3=272-3=269
=372-102-1=270-1=269