1) Khôi phục:
a) ...........+6xy+..........=(..........+3y)^2
b)............-.............+9y^2=(2x-.............)^2
c)...........-10xy+25y^2=(..........-...........)^2
d)9x^2+............+16y^2=(..........+..............)^2
e)27x^3+.............+...........+..........=(.............+2y)^3
f)x^3-6x^2y+..........-..........=(............-...........)^3
g)...............+12x^2y+.............+.............=(2x+...........)^3
h)8x^3-.............+................-y^3=(............-..............)^3
a) x2+6xy+9y2=(x+3y)^2
b)4x2-12xy+9y^2=(2x-3y)^2
c)x2-10xy+25y^2=(x-5y)^2
d)9x^2+24xy+16y^2=(3x+4y)^2
e)27x^3+54x2y+36xy2+8y3=(3x+2y)^3
f)x^3-6x^2y+12xy2-8y3=(x-2y)^3
g)8x3+12x^2y+6xy2+y3=(2x+y)^3
h)8x^3-12x2y+6xy2-y^3=(2x-y)^3
