375-124+125-276的简便算法375-124+125-276=（375+125）-（124+276）=500-400=100
(375+125)-(124+276)=500-400=100
=(375+125)-(124+276)=500-400=100
375-124+125-276=375+125-124-276=500-(124+276)=500-400=100
