6分之5+3分之2+4分之1= 7分之2+8分之3+7分之5= 9分之10-8分之3+8分之5= 45分之37-15分之3-15分之2=

问题描述:

6分之5+3分之2+4分之1= 7分之2+8分之3+7分之5= 9分之10-8分之3+8分之5= 45分之37-15分之3-15分之2=
8分之5+4分之7+2分之3=
3分之2-(5分之3-3分之1)=
3分之8-(5分之3+3分之1)=
9分之17-(4分之1+4分之3)=

5/8 + 7/4 + 3/2 = 5/8 +14/8 + 12/8 = 31/8
2/3 - (3/5 - 1/3) = 2/3 - (9/15 - 5/15) = 2/3 - 4/15 = 10/15- 4/15 = 6/15 = 2/5
8/3 - (3/5 + 1/3) = 40/15 - (9/15 - 5/15) = 40/15 - 4/15 = 36/15 = 12/5
17/9 - (1/4 + 3/4) = 17/9 -1 = 17/9 - 9/9 = 8/9