计算下列各题.(能简算的要简算)
(1)
(2)
(3)3.5×1.25+1.25+3.5÷0.8
(4).
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解:(1)()×12,
=12×,
=4+26-5,
=25;
(2)(3-112.5%)×,
=(3-1)×,
=(1)×,
=()×,
=()×,
=(×)×,
=1×,
=1;
(3)3.5×1.25+1.25+3.5÷0.8,
=3.5×1.25+1.25+3.5×1.25,
=1.25×(3.5+3.5+1),
=1.25×8,
=10;
(4)[()],
=÷[],
=÷,
=,
=.
解析分析:算式(1)(3)运用乘法的分配律计算会更加简便.算式(2)(4)按照四则混合的顺序进行计算,先算括号内部,再算括号外面的.
点评:本题考查了学生如何根据数据选择合适的运算定律及分析计算能力.