2y(2y-x)^4/6x(x-2y)^3
=2y(x-2y)^4/6x(x-2y)^3
=[2(x-2y)^3×y(x-2y)]/[2(x-2y)^3×3x]
=y(x-2y)/3x正确答案是xy-2y²／3x朝这个答案做~~跪求~~=y(x-2y)/3x=(xy-2y²)/3x