计算下面各题,能简算的要简算.(1)10÷8+3.96×12.5%+2.04×?(2)6000-105×36(3)85-84÷7???????????????????

发布时间:2020-08-11 09:11:01

计算下面各题,能简算的要简算.
(1)10÷8+3.96×12.5%+2.04×?
(2)6000-105×36
(3)85-84÷7???????????????????????????????
(4)
(5).

网友回答

解:(1)10÷8+3.96×12.5%+2.04×?
=1.25+3.96×12.5%+2.04×0.125,
=0.125×10+3.96×0.125+2.04×0.125,
=(10+3.96+2.04)×0.125,
=16×0.125,
=2;
(2)6000-105×36
=6000-(100+5)×36,
=6000-100×36-36×5,
=6000-3600-180,
=2220;
(3)85-84÷7
=85-(84+)÷7,
=85-84÷7-7,
=85-12-,
=72;
(4)
=÷[+],
=÷[+],
=×,
=;
(5)
=1×3.6+3.6×7+3.6,
=(1+7+1)×3.6,
=10×3.6,
=36.
解析分析:(1)据乘法算式的性质将原式变为0.125×10+3.96×12.5%+2.04×0.125后再据分配律进行简便运算;
(2)根据分配律将105×36变为(100+5)×36再据减法性质进行计算;
(3)可先据分配律将式中84÷7拆分为(84+)÷7再据减法性质进行简便计算;
(4)可将括号中的算式据分配律进行简便计算;
(5)将据分配律进行简便计算.

点评:完成此类题目要认真分析式中据,根据式中数据的特点及内在联系选择合适的方法进行简便计算.
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