搜搜考试网6.3*9.9简便计算
来源：学生作业帮助网 编辑：作业帮 时间：2024/07/11 13:50:36
=3.58*(10-0.1)+0.5=3.58*10-3.58*0.1+0.5=35.8-0.358+0.5=35.942
3.8*9.9+0.38=3.8*9.9+3.8*0.1=3.8*(9.9+0.1)=3.8*10=38
9.9×9.9+0.99=9.9×9.9+9.9×0.1=9.9×(9.9+0.1)=9.9×10=99
99.9×9.9=(100-0.1)*9.9=100*9.9-0.1*9.9=990-0.99=989.01
=1.36x9.9+1.36x0.1=1.36x(9.9+0.1)=1.36x10=13.6
9.9×9.9+19.9=9.9×（10-0.1）+19.9=9.9×10-9.9×0.1+19.9=99-0.99+19.9=99+18.91=117.91
=（8+0.8）*12.5*9.9=【8*12.5+0.8*12.5】*9.9=(100+10)*9.9=100*9.9+10*9.9=990+99=1089
原式=78.6-（16.7-10）+0.1=78.7-6.7=72实在不知道还能怎么简便了.
6.3×10.1=6.3×(10+0.1)=6.3×10+6.3×0.1=63+0.63=63.63再问：7.3*9.9的简便计算再答：7.3×9.9=7.3×(10-0.1)=7.3×10-7.3×
9.9×9.81=（10-0.1）×9.81=10×9.81-0.1×9.81=98.1-0.981=97.1+1-0.981=97.1+（1-0.981）=97.1+0.019=97.119
是都是加号吗?把9提取出来,得到原式=9×(0.7+11+1.1+0.4),然后再算就成了.
解题思路：化简小括号后，变为依次大1/2的等差数列。问题可求。解题过程：varSWOC={};SWOC.tip=false;try{SWOCX2.OpenFile("http://dayi.prced
=63*0.99+37*0.99=(63+37)*0.99=100*0.99=99
原式=6.3*（10+0.1）=6.3*10+6.3*0.1=63+0.63=63.63
19.6/（9.8/0.4）=19.6*0.4/9.8=2*0.4=0.86.3/1.8=7*0.9/2*0.9=7/2=3.5
"2.6×9.9=2.6×（10-0.1）=26-0.26=25.74"
4.3*（10-0.1）=4.3*10-4.3*0.1=43-0.43=42.57