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4+3-3=8+2+9=
19-5-4=12-6+3=
分析:本题可以直接根据整数加减法的法则进行计算,即可得出答案.
解答:解:①4+3-3
=7-3
=4;  
②8+2+9
=10+9
=19;
③19-5-4
=14-4
=10;     
④12-6+3
=6+3
=9.
点评:此题属于整数的加减混合运算,按照从左到右的顺序依次进行计算即可得到答案.
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