Cho đa thức :P=3.x^2y-{x.y.z-(2.x.y.z-x^2)-4x^2.z+[3.x^2.y.(4.x.y.z-5.x^2.z-3.x.y.z]} Phá ngoặc rồi thu gọn Tính gt của P tại x =-1;y=2;z=3

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