作业帮21.6×9.9简便算法
来源：学生作业帮助网 编辑：作业帮 时间：2024/04/30 15:09:33
(100-1)*58=100*58-58=5800-58=5742
1/4+1/28+1/70+...+1/9700=1/(1*4)+1/(4*7)+1/(7*10)+...1/(97*100)=1/3(1/1-1/4)+1/3(1/4-1/7)+1/3(1/7-1/
0.027+9.9x0.27=0.27×0.1+9.9×0.27=0.27×(0.1+9.9)=0.27×10=2.7
25×88=25x4x22=100x22=2200再问：那99×73+73？简便计算
9.9*99+9.9=9.9*（99+1）=9.9*100=990
3.37*0.99=3.37*(1-0.01)=3.37*1-3.37*0.01=3.37-0.0337=3.3363
再答： 再答： 再问：3.78/0.25/4再答： 再答：可以采纳我吗？
9.9×45＋4.5＝9.9×45＋45×0.1＝(9.9＋0.1)×45＝45×10＝450
解题思路：根据乘法交换律、乘法分配律，可求。解题过程：varSWOC={};SWOC.tip=false;try{SWOCX2.OpenFile("http://dayi.prcedu.com/inc
9.9X9.81=(10-0.1)X9.81=10X9.81-0.1x9.81=98.1-0.981=97.119
=0.78*（10-0.1）=0.78*10-0.78*0.1=7.8-0.078=7.722
原式=6.18*9.9+6.18*0.1=6.18*（9.9+0.1）=6.18*10=61.8
9.9*0.036+0.36=0.99*0.36+0.36=0.36*（0.99+1）=0.36*1.99=0.716
利用乘法分配率45*9.9=45x(10-0.1)=450-4.5=445.5
3.56×9.9+0.356或3.56×9.9+0.356=0.356×10×9.9+0.356=3.56×9.9+3.56×0.1=0.356×(10×9.9+1)=3.56×(9.9+0.1)=0
0.9+9.9+99.9=1-0.1+10-0.1+100-0.1=1+10+100-3×0.1=111-0.3=110.7
0.56×9.9+0.56×0.1=0.56×(9.9+0.1)=0.56×10=5.6
0.27+9.9x0.27=0.27+(10-0.1)x0.27=0.27+10x0.27-0.27x0.1=0.27+2.7-0.027=2.943