题目内容
简便计算:
÷7+× | 0.125×0.25×32 | 24×(+-) | 2-÷-. |
解:
(1)÷7+×,
=×+×,
=(+)×,
=1×,
=;
(2)0.125×0.25×32,
=0.125×0.25×(4×8),
=(0.125×8)×(0.25×4),
=1×1,
=1;
(3)24×(+-),
=24×+24×-24×,
=6+4-8,
=10-8,
=2;
(4)2-÷-,
=2--,
=2-(+),
=2-2,
=0.
分析:(1)根据乘法分配律进行计算;
(2)根据乘法交换律和结合律进行计算;
(3)根据乘法分配律进行计算;
(4)先算除法,再根据连减的性质进行计算.
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)÷7+×,
=×+×,
=(+)×,
=1×,
=;
(2)0.125×0.25×32,
=0.125×0.25×(4×8),
=(0.125×8)×(0.25×4),
=1×1,
=1;
(3)24×(+-),
=24×+24×-24×,
=6+4-8,
=10-8,
=2;
(4)2-÷-,
=2--,
=2-(+),
=2-2,
=0.
分析:(1)根据乘法分配律进行计算;
(2)根据乘法交换律和结合律进行计算;
(3)根据乘法分配律进行计算;
(4)先算除法,再根据连减的性质进行计算.
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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