1
-
3
---------------- 分式上下同乘以3
2 2 3
( - - - )* -
3 5 5
1/3÷(2/3-2/5)*3/5
=1/3*3/5÷(2/3-2/5)
=1/5÷(2/3-2/5)
=1/5÷(10/15-6/15)
=1/5÷4/15
=1/5x15/4
=3/4
=1/3 /(2/3*3/5-2/5*3/5)
=1/3 /(2/5-6/25)
=1/3 /(10/25-6/25)
=1/3*25/4
=25/12
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