(4a-b)(a+b)/(4a^2b-2ab^2)已知 a+b=3.5 a-b=1.5

问题描述:

(4a-b)(a+b)/(4a^2b-2ab^2)
已知 a+b=3.5 a-b=1.5

a+b=3.5 a-b=1.5 a=2.5 b=1 (4a-b)(a+b)/(4a^2b-2ab^2)=(10-1)*3.5/(10^2-5)=63/190