计算,能简算的要简算36×-+÷6.28×3.7+6.28×6.3+×9+80.8×10.1-8.08-×.

发布时间:2020-08-05 03:02:38

计算,能简算的要简算 36×-+÷6.28×3.7+6.28×6.3+×9+80.8×10.1-8.08-×.

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解:(1)36×-,
=(36-1)×
=35×,
=18;

(2)+÷,
=+,
=;

(3)6.28×3.7+6.28×6.3,
=6.28×(3.7+6.3),
=6.28×10,
=62.8;

(4)+×9+,
=++,
=+(+),
=+1,
=1;

(5)80.8×10.1-8.08,
=8.08×101-8.08,
=8.08×(101-1),
=8.08×100,
=808;

(6)-×,
=×(1-),
=×,
=.
解析分析:(1)根据乘法分配律进行简算;
(2)先算除法,再算加法;
(3)根据乘法分配律进行简算;
(4)先算乘法,再根据加法结合律进行简算;
(5)根据乘法分配律进行简算;
(6)根据乘法分配律进行简算.

点评:考查了运算定律与简便运算,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律简便计算.
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