Asignatura de matemáticas de secundaria

(1)=[(2X 3Y)(2X-3Y) (4X-3Y)2]* 1/-0.4X =(4X 2-9 x2 16 x2-12XY 9 y2)* 1/-0.4X =(20x 2-12XY)/-0.4X

=-50X 30Y

(2)(X2 6 9 X2-9)/2X =(2 x2 6)/2X = X 6 /2X

(3)3x2y *(3xy)-2x3y 2 *(3xy)=-9x3y 2 6x4y 3