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3/4减括号2/5+3/10括号用脱式计算怎么算

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。

(2/15)÷(1.1-3/4) =(2/15)÷(11/10-3/4) =(2/15)÷(22/20-15/20) =(2/15)÷(7/20) =8/21

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

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

脱式计算 1/2+2/5-3/10+3/5 =(1/2-3/10)+(2/5+3/5) =1/5+1 =1又1/5

1.45+15×6= 135 2.250÷5×8=400 3.6×5÷2×4=60 4.30×3+8=98 5.400÷4+20×5= 200 6.10+12÷3+20=34 7.(80÷20+80)÷4=21 8.70+(100-10×5)=120 9.360÷40+10= 19 10.40×20-200= 600 11.(80-25)*2= 110 12.70+45=115 13.90×2÷3= 60 14.16×6÷3= 32 15.300...

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

3/4-7/10+2/5 =15/20-14/20+8/20 =1/20+8/20 =9/20

先转换在算 先5分之4减10分之3,5分之4转换也就是10之8减掉10分之3=10分之5转换2分之1 最后2分之1+3分之2 转换6分之3+6分之4最终答案是6分之7

(1+99)×99/2

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