Sửa lại câu d) là `25y^2`
`a)x^3-1`
`=(x-1)(x^2+x+1)`
`b)8x^3-y^3`
`=(2x)^3-y^3`
`=(2x-y)(4x^2+2xy+y^2)`
`c)x^2-8x+16`
`=x^2-2.x.4+4^2`
`=(x-4)^2`
`d)25y^2-1`
`=(5y)^2-1`
`=(5y-1)(5y+1(`
`e)27-8y^3`
`=3^3-(2y)^3`
`=(3-2y)(9+6y+4y^2)`
`f)2x^2-8x+8`
`=2(x^2-4x+4)`
`=2(x-2)^2`
a) x3 - 1 = x3 - 13
= (x - 1)(x2 - x + 1)
b) 8x3 - y3 = (2x)3 - y3
= (2x - y)(4x2 + 2xy + y2)
c) x2 - 8x + 16 = x2 - 2.4x + 42
= (x - 4)2
d) đề có bị sai không , nên mình sưa lại đề nhé :
25y2 - 1 = (5y)2 - 12
= (5y - 1)(5y + 1)
e) 27 - 8y3 = 33 - (2y)3
= (3 - 2y)(9 + 6y + 4y2)
f) 2x2 - 8x + 8 = 2(x2 - 4x + 4)
= 2(x - 2)2
Chúc bạn học tốt
a) \(x^3-1=\left(x-1\right)\left(x^2+x+1\right)\)
b) \(8x^3-y^3=\left(2x-y\right)\left(4x^2+2xy+y^2\right)\)
c) \(x^2-8x+16=\left(x-4\right)^2\)
d) \(125y^3-1=\left(5y-1\right)\left(25y^2+5y+1\right)\)
e) \(27-8y^3=\left(3-2y\right)\left(9+6y+4y^2\right)\)
f) \(2x^2-8x+8=2\left(x^2-4x+4\right)=2\left(x-2\right)^2\)