Tìm \(a,\,\,b \in \mathbb{Z}\), biết rằng \(a.b = 12\) và \(a + b = - 7\).
A.\(\left( {a;b} \right) = \left\{ {\left( { - 4; - 3} \right);\,\left( { - 3; - 4} \right)} \right\}\)
B.\(\left( {a;b} \right) = \left\{ {\left( {4; - 3} \right);\,\left( { - 3;4} \right)} \right\}\)
C.\(\left( {a;b} \right) = \left\{ {\left( { - 4;3} \right);\,\left( {3; - 4} \right)} \right\}\)
D.\(\left( {a;b} \right) = \left\{ {\left( {4;3} \right);\,\left( {3;4} \right)} \right\}\)
A.\(\left( {a;b} \right) = \left\{ {\left( { - 4; - 3} \right);\,\left( { - 3; - 4} \right)} \right\}\)
B.\(\left( {a;b} \right) = \left\{ {\left( {4; - 3} \right);\,\left( { - 3;4} \right)} \right\}\)
C.\(\left( {a;b} \right) = \left\{ {\left( { - 4;3} \right);\,\left( {3; - 4} \right)} \right\}\)
D.\(\left( {a;b} \right) = \left\{ {\left( {4;3} \right);\,\left( {3;4} \right)} \right\}\)
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Hóa Học lớp 12
