计算下面各题,能简算的要简算.
(1)6-5.08×(0.875-)?????????
(2)42-11
(3)6.58×1+3.42÷
(4)2.4×(-)÷1
(5)[4+(1÷2×2.
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解:(1)6-5.08×(0.875-),
=6-5.08×0.25,
=6-1.27,
=5.33;
(2)42-11,
=30-23,
=7;
(3)6.58×1+3.42÷,
=1(6.58+3.42),
=110,
=16;
(4)2.4×(-)÷1,
=2.4×÷1,
=0.4÷1,
=0.35;
(5)[4+(1÷2×2,
=[4+1÷2×2,
=[4+]×2,
=4,
=9.
解析分析:(1)(2)(4)(5)依据四则运算顺序,先算第二级运算,再算第一级运算,如果只含有同一级运算,按照从左到右顺序计算,有括号先算括号里面的顺序解答,(3)运用乘法分配律解答.
点评:本题考查知识点:(1)依据四则运算顺序进行计算,(2)正确运用乘法分配律.