Thu gọn : C= ( 2x+y) ( 2z +y) + (x-y) (y-2) D= 3x (x-2y) -7/6 y (y-6x) E= 2x (10x^2 -5x-2) -5x (4x^2 -2x -1) F= a (a+1/3) – ( 1/5a +8) (5a -11) G= x^3 -30x^2 -31x +1 H= x^5 -15x^4 +16x^3 -29x^2 +13x K= x^14 -10x^13 +10x^12 -10x^11+…+10x^2 -10x

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