题目内容
怎样简便怎样算.
××6 | ×× | (+)×14 |
×+× | 100× | ×××. |
解:
(1)××6,
=×6×,
=5×,
=;
(2)××,
=×(×),
=×,
=;
(3)(+)×14,
=×14+×14,
=6+7,
=13;
(4)×+×,
=×(+),
=×1,
=;
(5)100×,
=(99+1)×,
=99×+1×,
=2+,
=2;
(6)×××,
=(×)×(×),
=×,
=.
分析:(1)根据乘法交换律进行计算;
(2)根据乘法结合律进行计算;
(3)根据乘法分配律进行计算;
(4)根据乘法分配律进行计算;
(5)根据乘法分配律进行计算;
(6)根据乘法结合律进行计算.
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.
(1)××6,
=×6×,
=5×,
=;
(2)××,
=×(×),
=×,
=;
(3)(+)×14,
=×14+×14,
=6+7,
=13;
(4)×+×,
=×(+),
=×1,
=;
(5)100×,
=(99+1)×,
=99×+1×,
=2+,
=2;
(6)×××,
=(×)×(×),
=×,
=.
分析:(1)根据乘法交换律进行计算;
(2)根据乘法结合律进行计算;
(3)根据乘法分配律进行计算;
(4)根据乘法分配律进行计算;
(5)根据乘法分配律进行计算;
(6)根据乘法结合律进行计算.
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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