Question

a,tính (x+1)(x-1)

b,tính (x-2y)(x+2y)

c)tính nhanh 56x64

Answer 1

a)  ( x + 1 ) ( x - 1 )

    = ( x² + 1 )

b) ( x - 2y ) ( x + 2y )

  = ( x² - 4y² )

c) 56 x 64 

  = ( 60 - 4 ) ( 60 + 4 )

  = 3 600 - 16

  = 3 584

Answer 2

a) = x² - 1

b) = x² - 4y²

Answer 3

a, (x-1). (x+1) = x^2 - 1^2

b, (x-2y).(x+2y) = x^2 - 2y^2

c, 56×64= 3584.

Cac bn nho ug ho mk nha thank.

Answer 4

a)=(x²+1)

b)=(x²-4y²)

c)=3584