Question

Rút gọn
(x+y-z)² - 2(x+y-z)(y-z)+(z-y)²

Answer 1

`(x+y-z)^2-2.(x+y-z).(y-z)+(z-y)^2`

`=(x+y-z)^2-2.(x+y-z).(y-z)+(y-z)^2`

`=[(x+y-z)-(y-z)]^2`

`=(x+2y)^2`

Answer 2

(x + y - z)² - 2 (x + y - z) (y - z) + (z - y)²

=> x³ - 2 - z³

Answer 3

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