Question

tính nhanh: a) (x^2 - 6xy + 9y^2) : ( 3 y - x)

b) (8x^3 - 1 ) : ( 4x^2 + 2x + 1)

c) ( 4x^4 - 9 ) : ( 2x^2 - 3 )

d) ( 8x^3 - 27 ) : ( 4x^2 + 6x + 9)

Answer 1

a) (x²-6xy+9y²):(3y-x)

= (x-3y)²:(3y-x)

=(3y-x)²:(3y-x)

= 3y-x

b) (8x³-1):(4x²+2x+1)

=[(2x)³-1]:(4x²+2x+1)

= (2x-1)(4x²+2x+1):(4x²+2x+1)

= 2x-1

Answer 2

c) (4x⁴-9):(2x²-3)

=(2x²-3)(2x²+3):(2x²-3)

=2x²+3

d) (8x³-27):(4x²+6x+9)

=(2x-3)(4x²+6x+9):(4x²+6x+9)

=2x-3