Tính: a, (2x ²+3y ³) ² b,(2x ²y -5xy ²) ² c, (2x+3y) ³ d, (4x+2y) ³

a) $(2x^2+3y^3)^2$

$=(2x^2)^2+2.2x^2.3y^3+(3y^3)^2$

$=4x^4+12x^2y^3+9y^6$

b) $(2x^2y-5xy^2)^2$

$=(2x^2y)^2-2.2x^2y.5xy^2+(5xy^2)^2$

$=4x^4y^2-20x^3y^3+25x^2y^4$

c) $(2x+3y)^3$

$=(2x)^3+3.(2x)^2.3y+3.2x.(3y)^2+(3y)^3$

$=8x^3+36x^2y+54xy^2+27y^3$

d) $(4x+2y)^3$

$=(4x)^3+3.(4x)^2.2y+3.4x.(3y)^2+(2y)^3$

$=64x^3+96x^2y+108xy^2+8y^3$