脱式计算,能简便的要写出简便过程
1.29+3.7+0.71+6.3528×78-428×78125×(92×8)57×101-57(40+4)×2535×9819×96-962÷74(520+480)÷50×4400-(1300÷65+35)86.7-(14.3-3.8)72.8-8.6+5.8440-(3.5-2.75+0.86)
脱式计算,能简便的要写出简便过程1.29+3.7+0.71+6.3528×78-428×78125×(92×8)57×101-57(40+4)×2535×9819×9
答案:2 悬赏:10 手机版
解决时间 2021-04-13 23:55
- 提问者网友:末路
- 2021-04-13 00:38
最佳答案
- 五星知识达人网友:等灯
- 2021-04-13 02:17
解:(1)1.29+3.7+0.71+6.3,
=(1.29+0.71)+(6.3+3.7),
=2+10,
=12;
(2)528×78-428×78,
=(528-428)×78,
=100×78,
=7800;
(3)125×(92×8),
=(125×8)×92,
=1000×92,
=92000;
(4)57×101-57,
=57×(101-1),
=57×100,
=5700;
(5)(40+4)×25,
=40×25+4×25,
=1000+100,
=1100;
(6)35×98,
=35×(100-2),
=3500-70,
=3430;
(7)19×96-962÷74,
=19×(100-4)-13,
=1900-76-13,
=1900-(76+13),
=1900-89,
=1811;
(8)(520+480)÷50×4,
=1000÷50×4,
=20×4,
=80;
(9)400-(1300÷65+35),
=400-(20+35),
=400-55,
=345;
(10)86.7-(14.3-3.8),
=86.7-10.5,
=76.2;
(11)72.8-8.6+5.84,
=64.2+5.84,
=70.04;
(12)40-(3.5-2.75+0.86),
=40-1.61,
=38.39.解析分析:(1)运用加法交换律和结合律简算;(2)(4)(5)运用乘法分配律简算;(3)运用乘法交换律与结合律简算;(6)把98看作100-2,运用乘法分配律简算;(7)先算除法和乘法,再算减法;(8)先算括号内的,再算括号外的除法最后算乘法;(9)先算扩阿红诶的处罚,再算括号内的加法,最后算括号外的减法;(10)先算括号内的,再算括号外的;也可先去括号,从左往右依次计算;(11)按运算顺序,从左往右依次计算;(12)先算括号内的,从左往右依次计算,最后算括号外的减法.点评:完成本题要注意运算顺序,同时注意分析式中数据,运用合适的简便方法计算.
=(1.29+0.71)+(6.3+3.7),
=2+10,
=12;
(2)528×78-428×78,
=(528-428)×78,
=100×78,
=7800;
(3)125×(92×8),
=(125×8)×92,
=1000×92,
=92000;
(4)57×101-57,
=57×(101-1),
=57×100,
=5700;
(5)(40+4)×25,
=40×25+4×25,
=1000+100,
=1100;
(6)35×98,
=35×(100-2),
=3500-70,
=3430;
(7)19×96-962÷74,
=19×(100-4)-13,
=1900-76-13,
=1900-(76+13),
=1900-89,
=1811;
(8)(520+480)÷50×4,
=1000÷50×4,
=20×4,
=80;
(9)400-(1300÷65+35),
=400-(20+35),
=400-55,
=345;
(10)86.7-(14.3-3.8),
=86.7-10.5,
=76.2;
(11)72.8-8.6+5.84,
=64.2+5.84,
=70.04;
(12)40-(3.5-2.75+0.86),
=40-1.61,
=38.39.解析分析:(1)运用加法交换律和结合律简算;(2)(4)(5)运用乘法分配律简算;(3)运用乘法交换律与结合律简算;(6)把98看作100-2,运用乘法分配律简算;(7)先算除法和乘法,再算减法;(8)先算括号内的,再算括号外的除法最后算乘法;(9)先算扩阿红诶的处罚,再算括号内的加法,最后算括号外的减法;(10)先算括号内的,再算括号外的;也可先去括号,从左往右依次计算;(11)按运算顺序,从左往右依次计算;(12)先算括号内的,从左往右依次计算,最后算括号外的减法.点评:完成本题要注意运算顺序,同时注意分析式中数据,运用合适的简便方法计算.
全部回答
- 1楼网友:玩世
- 2021-04-13 03:20
我明天再问问老师,叫他解释下这个问题
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