Решите неравенство ax²+bxy+cy²+dx+ky+p≤0 если:
а) а=1/2, b=c=0, d=k= -1,p= -4
б) a=c=1,b=0, d= -4, k=6, p=9
в) a=c=d=k=0, b=2, p= -16​
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