Ta có : = x3 + x2y - 2x2 - xy - y2 + 3y + x + 2017
= (x3 + x2y - 2x2) - (xy + y2 - 2y) + (x + y - 2) + 2019
= x2. (x + y - 2) - y(x + y - 2) + (x + y - 2) + 2019 = 2019
Vậy `x=2019`
Đáp án:
`M = x³ + x²y - 2x² - xy - x² + 3y + x + 2017`
`M = (x³ + x²y - 2x²) - (xy + y² - 2y) + (x-y-2) + 2019`
`M = x²(x+y-2)-y(x+y-2) + (x+y - 2) + 2019 = 2019`
`M = 0 + 2019 `
`M = 2019`
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