m (7x) ^ 2 - 7x * 0.2y + y ^ 2; =(7x-y)^ 2; Tac6(7x-y)^ 2 >=0 forall x Day xảy ra khi 4x - y = 0; 7x = y; x = 7/y Vay 6x^ 2 -4x+4)+(x -1 =(x-2)^ 2 +y^ 2 -1; Pa cc^ prime (x-2)^ 2

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19x ^ 2 - 14xy - y ^ 2; (7x)^ 2 +27x-y^ 2 ) ( 7c / (7x + y ^ 2) * 0 + x; =x-(7x+y)^ 2 <=0+x; tD*a_4 = 11 + a ^ 2 * va*Theta + 7x + y = 0; —————-; ( x= -y 7 vậy the thì cho gt 0

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làm theo mẫu trên. bỏ h. k làm nhanh giúp mình ạ