能简算的要简算 (3/4-3/5)÷7/10 (2/3+2/9)÷20/21 1-5/14能简算的要简算(3/4-3/5)÷7/10(2/3+2/9)÷20/211-5/14÷5/71/4÷(2/3+1/2)×4/5

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能简算的要简算(3/4-3/5)÷7/10(2/3+2/9)÷20/211-5/14能简算的要简算(3/4-3/5)÷7/10(2/3+2/9)÷20/211-5/14÷5/71/4÷(2/3+1/2

能简算的要简算 (3/4-3/5)÷7/10 (2/3+2/9)÷20/21 1-5/14能简算的要简算(3/4-3/5)÷7/10(2/3+2/9)÷20/211-5/14÷5/71/4÷(2/3+1/2)×4/5
能简算的要简算 (3/4-3/5)÷7/10 (2/3+2/9)÷20/21 1-5/14
能简算的要简算
(3/4-3/5)÷7/10
(2/3+2/9)÷20/21
1-5/14÷5/7
1/4÷(2/3+1/2)×4/5

能简算的要简算 (3/4-3/5)÷7/10 (2/3+2/9)÷20/21 1-5/14能简算的要简算(3/4-3/5)÷7/10(2/3+2/9)÷20/211-5/14÷5/71/4÷(2/3+1/2)×4/5
(3/4-3/5)÷7/10
=(15/20-12/20)x10/7
=3/20 x 10/7
=3/14
(2/3+2/9)÷20/21
=(6/9+2/9)x21/20
=8/9 x 21/20
=2/3 x 7/5
=14/15

1-5/14÷5/7
=1-5/14 x 7/5
=1-1/2
=1/2

1/4÷(2/3+1/2)×4/5
=1/4÷7/6 x 4/5
=6/28 x 4/5
=6/35

1) =(3/20)*(10/7)=3/14
2) =(6/9-2/9)*(21/20)=(4/9)*(21/20)=7/15
3) =1-(5/14)*(7/5)=1-1/2=1/2
4) =(1/4)*(4/5)/(7/6)=(1/5)*(6/7)=6/35