1.01乘以9.9简便计算.
来源:学生作业帮助网 编辑:作业帮 时间:2024/09/15 06:20:25
48乘以9.9加4.8=48*9.9+4,8=48*(9.9+0.1)=48*10=480
两种方法:1)(-99)*999=(1-100)*999=999-99900=-989012)(-99)*999=(-99)*(1000-1)=-99000+99=-98901再问:你好像写错了两处,
原式=0.64(100+100/4)=64+16=80
=1再答:看错了再答:
375-3.75=371.25
4.9乘以9.9加0.49=4.9×9.9+0.49=4.9×9.9+4.9×0.1=4.9×(9.9+0.1)=4.9×10=49
2.74*9.9+0.274=2.74*(10-0.1)+0.274=27.4-0.274+0.274=27.4
56.5*9.9+56.5=56.5*(9.9+1)=56.5*10.9=56.5*10+56.5*0.9=615.85抱歉之前看错了
=8*12.5*11=100*11=1100很高兴为你作答,如果你对我的回答满意,请【采纳为满意答案】,再问:有点看不懂再答:=8*11*12.5=(8*12.5)*11=100*11=1100很高兴
7.2乘以9.9=7.2*(10-0.1)=72-0.72=71.28
0.79×9.9=0.79×(10-0.1)=0.79×10-0.79×0.1=7.9-0.079=7.821
2.3×0.99=2.3×(1-0.01)=2.3×1-2.3×0.01=2.3-0.023=2.277
4.86×9.9=4.86×10-4.86×0.1=48.6-0.486=48.1144.9×1.02=5×1.02-0.1×1.02=5.1-0.102=4.9983.84乘以9.6+0.96乘以6
3.45×102=3.45×(100+2)=3.45×100+3.45×2=345+6.9=351.9再问:0.47×0.5×0.8简便计算再答:0.47×0.5×0.8=0.47×(0.5×0.8)
2007乘以2013=(2010-3)X(2010+3)=2010^2-3^2=4040091
125乘以808125×8×101=1000×101=101000
等于1.32*(10-0.1)+0.132=1.32*10-1.32*0.1+0.132=13.2