计算,能简单的要简算
48×(-) --+ 632-486÷18+395[-(+)]÷?????0.75×74+×25+75%???+++++.
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解:(1)48×(-),
=48×-48×,
=12-8,
=4;
(2)--+,
=()-(),
=5-4,
=1;
(3)632-486÷18+395,
=632-27+395,
=605+395,
=1000;
(4)[-(+)]÷,
=[-],
=0,
=0;
??
(5)0.75×74+×25+75%,
=0.75×(74+25+1),
=0.75×100,
=75;
(6)+++++,
=1-++…+,
=1-,
=.
解析分析:(1)运用乘法分配律解答,(2)运用加法交换律,以及减法简便运算解答,(3)先算第二级运算,再算第一级运算解答,(4)根据四则运算顺序解答,(5)运用乘法分配律解答,(6)化=1-,=…=,解答.
点评:本题主要考查学生对于四则运算顺序,以及四则运算简便算法的掌握.