神机妙算细又巧:(54+)÷936÷[(-)×3]2-÷-[-(-)]÷4÷5+÷2(+)×8+.
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解:(1)(54+)÷9,
=(54+)×,
=54×+×,
=6+,
=6;
(2)36÷[(-)×3],
=36÷[(×3-×3],
=36÷[2.5-1],
=36÷1.5,
=24;
(3)2-÷-,
=2--,
=2-(+),
=2-2,
=0;
(4)[-(-)]÷4,
=[-+]÷4,
=[+-]÷4,
=[1-]÷4,
=÷4,
=;
(5)÷5+÷2,
=×+×,
=×(+),
=×,
=;
(6)(+)×8+,
=×8+×8+,
=5++,
=5+(+),
=5+1,
=6.
解析分析:(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)根据连减的性质进行计算中括号里面的,最后算除法;
(5)根据乘法分配律进行计算;
(6)根据乘法分配律进行计算.
点评:四则运算,先弄清运算顺序,然后再进一步计算,能简算的要简算.