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2/5×括号1/5+8/21÷(4/7)括号脱式计算

2/5×[1/5+8/21÷(4/7)] =2/5x(1/5+2/3) =2/5x(13/15) =26/75

see

2/7+5/14+1/2 =4/14+5/14+7/14 =(4+5+7)/14 =16/14 =8/7

1. 1/8*14/8/7 =7/4/8/7 =7/4*7/8 =49/*32 2. 9/14/(6/5-3/4)*7/24 =9/14/9/20*7/24 =9/14*20/9*7/24 =20/14*7/24 =5/12 第三小题题目再发准确点行吗

24×(1/4+5/6-7/8) =6+20-21 =5

1/2 2/3×括号3/4-1/6括号除以7/9脱式计算 解: 1/2+ 2/3×(3/4-1/6)除以7/9 =1/2+2/3×7/12÷7/9 =1/2+1/2 =1

1/6+1/5+1/2 =5/30+6/30+15/30 =11/30+15/30 =13/15

12/77 2/1 3/5 2/3

脱式计算,能简便要简便。 3/5×1/5÷3/5 =3/5÷3/5×1/5 =1/5 2/7-5/8×2/7 =(1-5/8)×2/7 =3/8×2/7 =3/28 1/4÷2/3+2/3÷4 =3/2÷4+2/3÷4 =(3/2+2/3)÷4 =13/6÷4 =13/24 1/3÷1/5+4/5 =5/3+4/5 =37/15 [1-(1/4+3/8)]÷1/4 =(1-5/8)×4 =3/8×4 =3/2 4/9×3/16...

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