题目内容
能简便计算的要简便计算
5947-35×64
39×(396÷6)
487+199
823-699.
5947-35×64
39×(396÷6)
487+199
823-699.
分析:(1)先算乘法,再算减法;
(2)先算小括号里的除法,再算括号外的乘法;
(3)把199看作200-1进行解答;
(4)把699看作700-1进行简算.
(2)先算小括号里的除法,再算括号外的乘法;
(3)把199看作200-1进行解答;
(4)把699看作700-1进行简算.
解答:解:(1)5947-35×64
=5947-2240
=3707;
(2)39×(396÷6)
=39×66
=2574;
(3)487+199
=487+200-1
=287-1
=286;
(4)823-699
=823-(700-1)
=823-700+1
=123+1
=124.
=5947-2240
=3707;
(2)39×(396÷6)
=39×66
=2574;
(3)487+199
=487+200-1
=287-1
=286;
(4)823-699
=823-(700-1)
=823-700+1
=123+1
=124.
点评:本题主要考查学生依据四则运算计算顺序进行计算,以及运用简便算法解决问题的能力.
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