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9.9x0.81简便运算

9.9x0.81=(10-0.1)*0.81=10*0.81-0.1*0.81=8.1-0.81=7.29

0.027x9.9x0.81=0.9x(0.03+11+0.9)=(1-0.1)x11.93=1x11.93-0.1x11.93=11.93-1.193=10.737

=(10-0.1)*0.81=10*0.81-0.1*0.81=8.1-0.081=8,019

用简便方法计算9.9*9.81=(10-0.1)*9.81=10*9.81-0.1*9.81=98.1-0.981=97.1190.027*0.02+0.027*0.98=0.027*(0.02+0.98)=0.027*1=0.02715.8*68+32*15.8=15.8*(68+32)=15.8*100=1580

脱式计算9.9*8.1+0.81解题思路:四则运算规则(按顺序计算,先算乘除后算加减,有括号先算括号,有乘方先算乘方)即脱式运算(递等式计算)需在该原则前提下进行解题过程:9.9*8.1+0.81=(9.9+0.1)*8.1=10*8.1=81扩展资料B:先将两乘数末位对齐,然后分别使用第二个乘数,由末位起对每一位数依次乘上一个乘数,最后将所计算结果累加即为乘积,如果乘数为小数可先将其扩大相应的倍数,最后乘积在缩小相应的倍数;解题过程:步骤一:1*99=99步骤二:8*99=7920根据以上计算步骤组合结果向左移动2位小数点积为80.19存疑请追问,满意请采纳

9.9x9.81=9.9x(9.9-0.09)=9.9x9.9-9.9x0.09=(10-0.1)x(10-0.1)-0.891=100-2+0.01-0.891=98-0.881=97.119

=10*0.81-0.1*0.81 =8.1-0.081 =8.019 麻烦好心人给个好评,非常感谢!

9.9x0.78简便运算 =(10-0.1)x0.78 =10x0.78-0.1x0.78 =7.8-0.078 =7.722

9.9*7.45=(10-0.1)*7.45=74.5-0.745=73.755

9.9x0.81+0.1x0.81简便计算;9.9*0.81+0.1*0.81=(9.9+0.1)*0.81=10*0.81=8.1

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