Thực hiện phép tính
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1. THỰC HIỆN PHÉP TÍNH
1. x(x−2)+(3−x)(3+x)
2. (x+4)2−2(x−5)+(x+4)+(x−5)2
3. (16x4−20x2y3−4x5y):(−4x2)
4. 15+x+(x−5)(2x+3)−2x(x−3)
5. (2x−1)(x+3)−(x−2)2−x(x−1)
6. (x−3)(x2+3x+9)−x(x−2)(x+2)
7. −2x(−3x+2)−(x+2)2
8. [(4x2y)2−12x2y3−20x3y2]:(−2xy)2
9. x(3x+12)−(7x−20)+x2(2x−3)−x(2x+5)
10. (2x+1)2−(2x+1)(6−x)+(x−3)2