计算下面各题.(能简算的要简算) 4.38-1.56+0.62-0.441375+450÷18×2518-(+)×10536×0.25+65×-1÷4.
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解:
(1)4.38-1.56+0.62-0.44,
=(4.38+0.62)-(1.56+0.44),
=5-2,
=3;
(2)1375+450÷18×25,
=1375+25×25,
=1375+625,
=2000;
(3)18-(+)×105,
=18-(×105+×105),
=18-(7+5),
=18-12,
=6;
(4)36×0.25+65×-1÷4,
=36×0.25+65×0.25-1×0.25,
=(36+65-1)×0.25,
=100×0.25,
=25.
解析分析:(1)根据加法交换律和结合律以及减法的性质进行简算;
(2)先算除法,再算乘法,最后算加法;
(3)根据乘法分配律进行简算;
(4)根据乘法分配律进行简算.
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.