Trong các khẳng định sau, khẳng định nào đúng?
A.\(\left\{ \begin{align} & a<b \\ & c<d \\ \end{align} \right.\Rightarrow a-c<b-d\)
B.\(\left\{ \begin{array}{l}a > b\\c > d\end{array} \right. \Rightarrow a - c > b - d\)
C.\(\left\{ \begin{array}{l}a > b\\c > d\end{array} \right. \Rightarrow a - d < b - c\)
D.\(\left\{ \begin{array}{l}a 0\\c > d > 0\end{array} \right. \Rightarrow a - c > b - d\)
A.\(\left\{ \begin{align} & a<b \\ & c<d \\ \end{align} \right.\Rightarrow a-c<b-d\)
B.\(\left\{ \begin{array}{l}a > b\\c > d\end{array} \right. \Rightarrow a - c > b - d\)
C.\(\left\{ \begin{array}{l}a > b\\c > d\end{array} \right. \Rightarrow a - d < b - c\)
D.\(\left\{ \begin{array}{l}a 0\\c > d > 0\end{array} \right. \Rightarrow a - c > b - d\)
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