题目内容
计算下列各题,能简算的要简算.
25%×63+37× | 101×- | 375-448÷8×5 |
[75×(6.9-3.72)]÷0.6 | (+-)×36 | +(+)÷. |
解:(1)25%×63+37×,
=0.25×63+37×0.25,
=0.25×(63+37),
=0.25×100,
=25;
(2)101×-,
=(101-1)×,
=100×,
=80;
(3)375-448÷8×5,
=375-56×5,
=375-280,
=95;
(4)[75×(6.9-3.72)]÷0.6,
=[75×3.18]÷0.6,
=238.5÷0.6,
=397.5;
(5)(+-)×36,
=×36+×36-×36,
=16+9-15,
=25-15,
=10;
(6)+(+)÷,
=+÷,
=+,
=.
分析:(1)根据乘法分配律进行计算;
(2)根据乘法分配律进行计算;
(3)先算除法,再算乘法,最后算减法;
(4)先算减法,再算乘法,最后算除法;
(5)根据乘法分配律进行计算;
(6)先算小括号里面的加法,再算除法,最后算小括号外面的加法.
点评:四则运算,先弄清运算顺序,然后再进一步计算即可,能简算的要简算.
=0.25×63+37×0.25,
=0.25×(63+37),
=0.25×100,
=25;
(2)101×-,
=(101-1)×,
=100×,
=80;
(3)375-448÷8×5,
=375-56×5,
=375-280,
=95;
(4)[75×(6.9-3.72)]÷0.6,
=[75×3.18]÷0.6,
=238.5÷0.6,
=397.5;
(5)(+-)×36,
=×36+×36-×36,
=16+9-15,
=25-15,
=10;
(6)+(+)÷,
=+÷,
=+,
=.
分析:(1)根据乘法分配律进行计算;
(2)根据乘法分配律进行计算;
(3)先算除法,再算乘法,最后算减法;
(4)先算减法,再算乘法,最后算除法;
(5)根据乘法分配律进行计算;
(6)先算小括号里面的加法,再算除法,最后算小括号外面的加法.
点评:四则运算,先弄清运算顺序,然后再进一步计算即可,能简算的要简算.
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