3.6÷40%×
3÷-÷3-3
1-×[7-(2+0.125÷)÷2]
(2-1)×1.6÷(182×)
[6-(+)×30]÷(1×0.9)
[13-(4+1.75×2)]÷3.
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解:(1)3.6÷40%×,
=3.6÷0.4×0.1,
=9×0.1,
=0.9;
(2)3÷-÷3-3,
=3×-×-3,
=4--3,
=4-(+3),
=4-4,
=0;
(3)1-×[7-(2+0.125÷)÷2],
=1-×[7-(2+×4)÷2],
=1-×[7-(2+)÷2],
=1-×[7-3÷2],
=1-×[7-1],
=1-×6,
=1-,
=;
(4)(2-1)×1.6÷(182×),
=(-)×÷26,
=××,
=;
(5)[6-(+)×30]÷(1×0.9),
=[6-()×30]÷(),
=[6-×30]÷,
=[6-]÷,
=×,
=;
(6)[13-(4+1.75×2)]÷3,
=[13-(4+×2)]÷3,
=[13-(4+)]÷3,
=[13-8]÷3,
=×,
=.
解析分析:(1)把百分数和分数化为小数计算比较简便;(2)把除法改为乘法,然后按运算顺序计算,先算乘法,再算减法;(3)(4)(5)(6)题,把小数化为分数,然后按运算顺序计算,先算小括号内的,再算中括号内的,最后算括号外的.
点评:此题考查了学生对分数四则混合运算顺序的掌握情况,以及根据数字特点进行简算的能力.