题目内容
选择合适的方法计算下面各题:
×0.25+÷4- | ×0.375-÷ |
-÷- | 302×15-6950÷50. |
解:
(1)×0.25+÷4-,
=×+×-,
=(+-1)×,
=0×,
=0;
(2)×0.375-÷,
=×0.375-×0.375,
=(-)×0.375,
=1×0.375,
=0.375;
(3)-÷-,
=--,
=-(+),
=-1,
=;
(4)302×15-6950÷50,
=4530-139,
=4391.
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,再根据连减的性质进行计算;
(4)先算乘法和除法,再算减法.
点评:四则运算,先弄清运算顺序,然后再进一步计算,能简算的要简算.
(1)×0.25+÷4-,
=×+×-,
=(+-1)×,
=0×,
=0;
(2)×0.375-÷,
=×0.375-×0.375,
=(-)×0.375,
=1×0.375,
=0.375;
(3)-÷-,
=--,
=-(+),
=-1,
=;
(4)302×15-6950÷50,
=4530-139,
=4391.
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,再根据连减的性质进行计算;
(4)先算乘法和除法,再算减法.
点评:四则运算,先弄清运算顺序,然后再进一步计算,能简算的要简算.
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