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二点五乘四十点一怎样用脱式计算

=40×2.5×8.2 =100×8.2 =820

2.96×40 =(3-0.04)×40 =3×40-0.04×40 =120-1.6 =118.4

20.05*39+200.5*4.1+40*10.025=2005 =20.05*39+20.05*4.1*10+20.05*20 =20.05*(39+41+20) =20.05*100 =2005 是不是

10.64+7.56×2.4+11.76 =10.64+18.144+11.76 =28.784+11.76 =40.544

简便计算: 20.07×39+200.7×4.1+40×10.038 =200.7×(3.9+4.1)+4×100.38 =200.7×2×4+4×100.38 =401.4×4+4×100.38 =4×(401.4+100.38) =4×501.78 =2007.12

答案: 约等于5.13 解题: 三点四二乘以一点五等于5.13,根据四舍五入的规则,一个数精确到百分位看千分位上的数,千分位是0小于5,不进位,那么这个数约等于5.13。

11.11*46-11.5*25+11.1*79 =(11.1+0.01)*46-(11.1+0.4)*25+11.1*79 =11.1*46+0.01*46-11.1*25-0.4*25+11.1*79 =11.1*(46-25+79)+0.46-10 =11.1*100+0.46-10 =1110-10+0.46 =1100.46

原式 =5.9x4.8+59x0.42+5.9 =5.9x4.8+5.9x4.2+5.9x1 =5.9x(4.8+4.2+1) =5.9x(9+1) =5.9x10 =59

3.6

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