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99.9×77.5+7.75的巧算

=99.9乘以77.5+77.5乘0.1=77.5乘(99.9+0.1)=7750

你好简便算法如下99.9*10.1=(10-0.1)*(10+0.1)=10-0.1=100-0.01=99.99

32.1*99.9+3.21=32.1x99.9+32.1x0.1=32.1x(99.9+0.1)=32.1x100=3210亲,请【采纳答案】,您的采纳是我答题的动力,谢谢.

1. 99.9*77.5+7.75 =999*7.75+7.75 =7.75*(999+1)=7.75*1000=77502. 0.42*160+36*1.6-31*3.2 =42*1.6+36*1.6-62*1.6=1.6*(42+36-62)=1.6*16=25.63. (11.7+9.9)/0.9 =(117+99)/9=117/9+99/9=13+11=244. 13.95/2-3.95*0.5=13.95*0.5-3.95*0.5=(13.95-3.95)*0.5=10*0.5=5

99.9+10.1 =100-0.1+10+0.1 =100+10-0.1+0.1 =110 99.9*10.1 =(100-0.01)*10.1 =100*10.1-0.01*10.1 =1010-0.101 =1009.899

99.9*7.78+33.3*6.66=99.9*7.78+99.9*2.22=99.9*(7.78+2.22)=999

15.25 - 8.68 + 7.75=15.25 + 7.75 - 8.68=23 - 8.68=14.32希望我的回答对您有帮助,满意请采纳,谢谢.

456x1001001001=456*(1000000000+1000000+1000+1)=456*1000000000+456*1000000+456*1000+456*1=456456456456

凑数提取33.3

99.9X100.1=(100-0.1)*(100+0.1)=10000-0.01=9999.99

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