计算下面各题,能简算的要简算.
2×1.5+2.5?????????????(1-×)÷ ????????????×+0.75×35%(+)×4+.
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解:(1)2×1.5+2.5,
=3+2.5,
=5.5;
(2)(1-×)÷,
=(1-)÷,
=×,
=;
(3)×+0.75×35%,
=×+×,
=(+)×,
=1×,
=;
(4)(+)×4+,
=×4+×4+,
=(+)+1,
=1+1,
=2.
解析分析:(1)先算乘法,再算加法;
(2)先算括号内的乘法,再算括号内的减法,最后算除法;
(3)把小数和百分数化为分数,运用乘法分配律简算;
(4)运用乘法分配律以及加法交换律与结合律简算.
点评:此题考查了小数、分数的四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.