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If \( 0abcd \leq 1 \), equation \( a x^{2}+(1-a b- \)
\( a c) x+a... VIDEO
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If \( 0abcd \leq 1 \), equation \( a x^{2}+(1-a b- \)
\( a c) x+a b c-d=0 \) has
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(1) real roots
(2) roots of opposite signs
(3) one root \( \in(a, b) \)
(4) one root \( \in(b, c) \)
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