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脱式计算(能简算的,要简算) (2/5加1/3)乘以15 8/9乘2

①3 13 15 -2 13 14 +5 2 15 -1 1 14 ,=(3 13 15 +5 2 15 )-(2 13 14 +1 1 14 ),=9-4,=5;②14.85-1.58×8+31.2÷1.2,=14.85-12.64+26,=2.21+26,=28.21;③(1 1 3 +2 1 2 )÷(2-1 1 2 ),= 23 6 ÷ 1 2 ,=7 1 2 ;④2.25× 3 5 +2.75÷1 2...

答案是:119,1486,184,18,691,24

5.5x2.3+1.7x5.5 =5.5x(2.3+1.7) =5.5x4 =22 朋友,请采纳正确答案,你们只提问,不采纳正确答案,回答都没有劲!!! 朋友,请【采纳答案】,您的采纳是我答题的动力,如果没有明白,请追问。谢谢。

(1)6.72-2.3÷0.5×0.8=6.72-4.6×0.8=6.72-3.68=3.04;(2)98-17+18-67=(98+18)-(17+67)=54-1=14;(3)910÷[12×(65-310)]=910÷[12×910]=910÷920=2;(4)(27+15)×7×5=27×7×5+15×7×5=10+7=17.

18乘括号1/2加1/3加2/9 =18乘(9/18加6/18加4/18) =18乘19/18 =19

3分之2除以8分之5加上3分之1除以8分之3脱式计算 解: 2/3÷5/8+1/3÷3/8 =16/15+8/9 =88/45

九分之8加 括号1-3/4括号回来乘以九分之四脱式计算 8/9+(1-3/4)x4/9 =8/9+1/4x4/9 =8/9+1/9 =1

①7.69×2.1+2.1×1.31+2.1=(7.69+1.31+1)×2.1=10×2.1=21②18-(1.4+1.25×2.4)=18-(1.4+1.25×8×0.3)=18-[1.4+(1.25×8)×0.3]=18-[1.4+3]=18-4.4=13.6③7.2÷1.6+0.8=4.5+0.8=5.3④4×4.5-3X=6.33 18-3x=6.38 18-3x+3x=6.33+3x 3x+6.33=183x+6.33-6...

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