(4x^2-y^2)/(x^2-4y^2)-(2x-y)^2/(x^2-4y^2)-(2y^2-4xy)/(x^2-4y^2)=?如题、、、

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(4x^2-y^2)/(x^2-4y^2)-(2x-y)^2/(x^2-4y^2)-(2y^2-4xy)/(x^2-4y^2)=?如题、、、(4x^2-y^2)/(x^2-4y^2)-(2x-y)^2

(4x^2-y^2)/(x^2-4y^2)-(2x-y)^2/(x^2-4y^2)-(2y^2-4xy)/(x^2-4y^2)=?如题、、、
(4x^2-y^2)/(x^2-4y^2)-(2x-y)^2/(x^2-4y^2)-(2y^2-4xy)/(x^2-4y^2)=?
如题、、、

(4x^2-y^2)/(x^2-4y^2)-(2x-y)^2/(x^2-4y^2)-(2y^2-4xy)/(x^2-4y^2)=?如题、、、
先提公因式,再化简
原式＝(2x-y)(2x+y-2x+y+2y)/(x^2-4y^2)
=(2x-y)*4y/(x^2-4y^2)=(8xy-4y^2)/(x^2-4y^2)

(4x^2-y^2)/(x^2-4y^2)-(2x-y)^2/(x^2-4y^2)-(2y^2-4xy)/(x^2-4y^2)=?如题 、、、

(4x^2-y^2)/(x^2-4y^2)-(2x-y)^2/(x^2-4y^2)-(2y^2-4xy)/(x^2-4y^2)=?如题、、、