Tính y / (2x^2 - xy) + 4x / (y^2 - 2xy)
Tính:
y2x2−xy+4xy2−2xy.
Tính:
y2x2−xy+4xy2−2xy.
y2x2−xy+4xy2−2xy=yx(2x−y)+4xy(y−2x)
=−y2xy(y−2x)+4x2xy(y−2x) (Mẫu thức chung là: xy(y – 2x))
= −y2+4x2xy(y−2x)= (2x)2−y2xy(y−2x) = (2x−y)(2x+y)xy(y−2x)
=−(y−2x)(2x+y)xy(y−2x) = −2x−yxy.