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3/4减括号2/5+3/10括号用脱式计算怎么算

3/4-(2/5+3/10) =3/4-7/10 =15/20-14/20 =1/20

2/3乘以中括号3/10除以小括号1/3+2/5小括号中括号=2/3*【3/10/(1/3+2/5)】=2/3*【3/10/(11/15)=2/3*9/22=3/11。

4/5-3/10+2/3 =24/30-9/30+20/30 =35/30 =7/6

3×(2/15+1/12)-2/5 =3×13/60-2/5 =13/20-2/5 =1/4

40/30-(4/10+3/10) 40/30-21/30 19/30

17/20-(2/5+19/20) =17/20-(8/20+19/20) =17/20-27/20 =-10/20 =-1/2 3/10+1/3+1/10 =9/30+10/30+3/30 =19/30+3/30 =22/30 =11/15

4/5+3/8×4/3-3/10 =4/5+1/2-3/10 =8/10+5/10-3/10 =13/10-3/10 =1 (1-4/5×1/12)除以1/3 =(1-1/15)*3 =(14/15)*3 =14/5 【160%-(2/5+40%)】除以1/2 =(160%-4/5)*2 =(4/5)*2 =8/5 【3/4-(7/16-0.25)】×17/9 =(3/4-3/16)*(17/9) =(9/16...

首先帮你补补课:脱式计算的概念 概念:主要掌握的是记住要先算乘、除法,后算加、减法。在乘除法连继计算时中,要按从左往右的顺序依次计算。遇到括号,要首先计算括号内部。在脱式过程中要按运算顺序划出运算顺序线,还要做到“三核对”,一要核...

(3/4+1/6)*2/3 =(9/12+2/12)x2/3=11/18 25*1/5-5*1/5 =5-1=4 6/11*7/15*10 =60/15x7/11=28/11 (1/7+1/4)*28 =4+7=11 (21+2/5)*5/7 =15+2/7 39*7/13*2/3=14 60*2/5=12x2=24 4*2/9=8/9 3/10*2/3+1/4=1/5+1/4=9/20 20*2/5-5/8 =8-5/8=6+3/8 2/9...

脱式计算 (3/4+1/6)*2/3 =3/4*2/3+1/6*2/3 =1/2+1/9 =11/18 25*1/5-5*1/5 =5-1 =4 6/11*7/15*10 =84/33 =28/11 (1/7+1/4)*28 =1/7*28+1/4*28 =4+7 =11 (21+2/5)*5/7 =21*5/7+2/5*5/7 =15+2/7 =15又2/7 39*7/13*2/3 =14

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