用简便方法计算. ①4.45+0.63+5.55②45.5-(0.98+5.5)③0.96-0.28+0.04-0.72.
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解:①4.45+0.63+5.55,
=(4.45+5.55)+0.63,
=10+0.63,
=10.63;
②45.5-(0.98+5.5),
=45.5-0.98-5.5,
=(45.5-5.5)-0.98,
=40-0.98,
=40-(1-0.02),
=40-1+0.2,
=39.02;
③0.96-0.28+0.04-0.72,
=(0.96+0.04)-(0.28+0.72),
=1-1,
=0.
解析分析:①运用加法交换律与结合律简算;②运用减法以及加法交换律与结合律简算;③运用加法交换律与结合律以及减法的性质简算.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.