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Bài 1: Tính. 1) (−3𝑥 2𝑦 − 2𝑥𝑦 2 + 6) + (−𝑥 2𝑦 + 5𝑥𝑦 2 − 1) 2) 6𝑥 2 + 9𝑥𝑦 − 𝑦 2 − (5𝑥 2 + 2𝑥𝑦) 3) (2,4𝑥 2 + 1,7𝑦 2 + 2𝑥𝑦) − (0,4𝑥 2 − 1,3𝑦 2 + 𝑥𝑦) 4) 𝑥 2 − 7𝑥𝑦 + 8𝑦 2 + (3𝑥𝑦 − 4𝑦 2 ) 5) (25𝑥 2𝑦 − 13𝑥𝑦 2 + 𝑦 3 ) − (11𝑥 2𝑦 − 2𝑦 3 ) 6) (3𝑥 2 − 2𝑥𝑦 + 𝑦 2 ) + (𝑥 2 − 𝑥𝑦 + 2𝑦 2 ) − (4𝑥 2 − 𝑦 2 ) 7) (𝑥 2 + 𝑦 2 − 2𝑥𝑦) − (𝑥 2 + 𝑦 2 + 2𝑥𝑦) + (4𝑥𝑦 − 1) 8) (𝑥 2 + 𝑦 2 − 2𝑥𝑦 2 ) − (6𝑥 2 − 3𝑥𝑦 2 ) 9) 5𝑥𝑦 + 𝑥 2 − 7𝑦 2 + (2𝑥𝑦 − 4𝑦 2 ) 10) −2𝑥 3 + 𝑥𝑦2 + 3𝑥 − (3𝑥 3 − 𝑥𝑦 2 + 4𝑥) giúp mình với
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