[(2a-2b/a^2-2ab+b^2)+(b/a^2-b^2)]÷3b+2a/a-b,且a=5,b=2.急

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[(2a-2b/a^2-2ab+b^2)+(b/a^2-b^2)]÷3b+2a/a-b,且a=5,b=2.急[(2a-2b/a^2-2ab+b^2)+(b/a^2-b^2)]÷3b+2a/a-b,且a

[(2a-2b/a^2-2ab+b^2)+(b/a^2-b^2)]÷3b+2a/a-b,且a=5,b=2.急
[(2a-2b/a^2-2ab+b^2)+(b/a^2-b^2)]÷3b+2a/a-b,且a=5,b=2.

[(2a-2b/a^2-2ab+b^2)+(b/a^2-b^2)]÷3b+2a/a-b,且a=5,b=2.急
[(2a-2b/a^2-2ab+b^2)+(b/a^2-b^2)]÷((3b+2a)/(a-b))
=-(((a - b) (-2 a^3 + b + 2 a^3 b))/(a^2 (2 a + 3 b)))
=-(((5 - 2) (-2* 5^3 + 2 + 2 *5^3*2))/(5^2 (2*5 + 3*2)))
=-(189/100)