+÷×+÷(156×-26)×2012+558÷18×243.87+1.44-0.87+0.5635×(1-)÷.

发布时间:2020-08-09 08:39:59

+÷×+÷(156×-26)×2012+558÷18×243.87+1.44-0.87+0.5635×(1-)÷.

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解:(1)+÷,
=+,
=;

(2)×+÷,
=×+×,
=×(+),
=×1,
=;

(3)(156×-26)×,
=(48-26)×,
=22×,
=16;

(4)2012+558÷18×24,
=2012+31×24,
=2012+744,
=2756;

(5)3.87+1.44-0.87+0.56,
=(3.67-0.87)+(1.44+0.56),
=3-2,
=1;

(6)35×(1-)÷,
=35×÷,
=20,
=48.
解析分析:(1)先算除法,再算加法;
(2)先把除法变成乘法,再运用乘法分配律简算;
(3)先算小括号里面的乘法,再算小括号里面的减法,再算括号外的乘法;
(4)先算除法,再算乘法,最后算加法;
(5)运用加法交换律和结合律简算;
(6)先算小括号里面的减法,再算括号外的乘法,最后算除法.


点评:本题考查了四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律进行简便计算.
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