mwbr.net
当前位置:首页 >> 7.5×23+31×2.5的简便运算 >>

7.5×23+31×2.5的简便运算

7.5x23+31x2.5 =2.5x3x23+31x2.5 =2.5x69+31x2.5 =2.5x(69+31) =2.5x100 =250

七点5+23乘二点5×31简便运算 解: 题目符号打错,应该是: 7.5×23+2.5×31 =2.5×69+2.5×31 =2.5×(69+31) =2.5×100 =250

奥数基本的要求就是口算功能,上述题目常理按照互乘四位数乘四位数对于小学生可能有些难度,分开吧,换算成(15/2)*23*31*(5/2)再转换(75/4)*((23*30)+(23*1)) ,75改成100-25也可以口算,最后除4,也可以口算。将运算最大控制在2位...

31×24-52×29+31*28的简便运算方法 =31x(24+28)-52x29 =31x52-52x29 =(31-29)x52 =2x52 =104

56×23+25×77+31×77 =56x23+(25+31)x77 =56x23+56x77 =56x(23+77) =56x100 =5600

231 247 31 23 =231+247+30+1+23 =(231+1)+(247+30+23) =232+300 =532

原式 =(21+39)+(23+37)+(25+35)+(27+33)+(29+31) =60+60+60+60+60 =60x5 =300 或者 =(21+39)x10÷2 =60x10÷2 =60x5 =300 供参考。

200-23x31 =200-713 =-513

14/31×23+17/31×23+23 =23×(14/31+17/31+1) =23×2 =46

网站首页 | 网站地图
All rights reserved Powered by www.mwbr.net
copyright ©right 2010-2021。
内容来自网络,如有侵犯请联系客服。zhit325@qq.com