Question

1) Phân tích thành phân tử:

a) 6x^2 - 12x

b) x^2 - 12x + 36

c) 8xy - 16x^2 - y^2 

d)125y^3 + 1/64

e) 1/64x^2 + 1/64

Answer 1

a)6x²-12x=6x(x-2)

b)x²-12x+36=(x-6)²

c)8xy-16x²-y²=-(4x-y)²

d)125x³+1/64=(5x+1/4)(25x²-5/4x+1/16)

e)1/64x²+1/64=1/64(x²+1)

Answer 2

a, 6x^2 - 12x = 6x ( x-2)

b, x^2 - 12x + 36 = x^2 - 2.x.6 + 36 = ( x -6)^2

c, 8xy - 16x^2 - y^2 = - [ 16x^2 - 8xy + y^2) = - (4x - y)^2

d, 125y^3 + 1/64 = ( 5y + 1/4)(25y^2 - 5/4y + 1/16)

e, 1/64 x^2 + 1/64 = 1/64( x^2+1)