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NGUYỄN DUY HƯNG
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2025-02-18 20:03:31
a) P(x) = 2x³ - 3x + 5x² + 2 + x
= 2x³ + 5x² + (-3x + x) + 2
= 2x³ + 5x² - 2x + 2
Q(x) = -x³ - 3x² + 2x + 6 - 2x²
= -x³ + (-3x² - 2x²) + 2x + 6
= -x³ - 5x² + 2x + 6
b) P(x) + Q(x) = (2x³ + 5x² - 2x + 2) + (-x³ - 5x² + 2x + 6)
= 2x³ + 5x² - 2x + 2 - x³ - 5x² + 2x + 6
= (2x³ - x³) + (5x² - 5x²) + (-2x + 2x) + (2 + 6)
= x³ + 8
P(x) - Q(x) = (2x³ + 5x² - 2x + 2) - (-x³ - 5x² + 2x + 6)
= 2x³ + 5x² - 2x + 2 + x³ + 5x² - 2x - 6
= (2x³ + x³) + (5x² + 5x²) + (-2x - 2x) + (2 - 6)
= 3x³ + 10x² - 4x - 4
2025-02-18 20:02:28
a) Tập hợp M:
M={xanh; đỏ; vàng; da cam; tím; trắng; hồng}
b) Xác xuất để biêna cố trên xảy ra là:
�=1/7P=1/7