Thu gọn biểu thức: a) 65x^9y^5:(-13x^4y^4); b)x(x - y) - y(y^2 - x);
Giải thích
a) 65x9y5:−13x4y4
=−5x5y.
b) xx−y−yy2−x
=x2−xy−y3+xy
=x2−y3.
c) x−yx2+y2−x4y−xy4:xy
=x3+xy2−x2y+y3−x3−y3
=x3+xy2−x2y−y3−x3+y3
=xy2−x2y
a) 65x9y5:−13x4y4
=−5x5y.
b) xx−y−yy2−x
=x2−xy−y3+xy
=x2−y3.
c) x−yx2+y2−x4y−xy4:xy
=x3+xy2−x2y+y3−x3−y3
=x3+xy2−x2y−y3−x3+y3
=xy2−x2y