Question

[Bùi Minh Hải]

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

Answer 1

[Minh Triều]

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