简便计算(125x99十125)x16 =125x8x2x（99+1） =2000x100 =200000
（125X99十125)X16 =125X（99十1）X16 =125X100X16 =（125X8）X（100X2） =1000X200 =200000
你好！简便算法是： (125X99+125)X16 =[125X(99+1))]X16 =[125X100]X16 =12500X16 =200000
25+25x99可以看作25x（99+1）=2500 2500x16=50000