~ gửi bạn ~
`1) (y + 2z – 3)(y -2z -3)`
` = y^2 + 4z^2 - 9`
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`2) (2y – 3)^³`
` = 8y^3 - 36y^2 + 54y - 27`
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`3) (2 - y)^3`
` = 8 - 12y + 6y^2 - y^3`
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`4) (2y - 5)(4y^2 + 10y + 25)`
` = 8y^3 - 125`