用简便方法计算 (1)(+163)-[(+63)+(-259)+(-41)] (2)(-3.635)-[(-2.635)+(-1.456)+(+3.456)] (3)(-5.4)+(+0.2)+(-0.6)+(+0.8)
參考答案:1、(1)(+163)-[(+63)+(-259)+(-41)]
=(163-63)+(259+41)=100+300=400
2、)(-3.635)-[(-2.635)+(-1.456)+(+3.456)]
=-(3.635-2.635)-(3.456-1.456)
=-1-2=-3
3、 (-5.4)+(+0.2)+(-0.6)+(+0.8)
=-(5.4+0.6)+(0.2+0.8)
=-6+1
=-5