Thu gọn biểu thức: a) 3/4x^3y^3:(-1/2x^2y^2); b) x(x - y) + y(x + y); c)
Giải thích
a) 34x3y3:−12x2y2
=34:−12⋅x3:x2⋅y3:y2
=−32xy.
b) xx−y+yx+y
=x2−xy+xy+y2
=x2+y2
c) x+3yx−2y−x4y−6x2y3:x2y
=x2−2xy+3xy−6y2−x2−6y2
=x2+xy−6y2−x2+6y2
=xy
a) 34x3y3:−12x2y2
=34:−12⋅x3:x2⋅y3:y2
=−32xy.
b) xx−y+yx+y
=x2−xy+xy+y2
=x2+y2
c) x+3yx−2y−x4y−6x2y3:x2y
=x2−2xy+3xy−6y2−x2−6y2
=x2+xy−6y2−x2+6y2
=xy