函数\(y = {\left( { - 2x + 1} \right)^4}\)的导数为( ). A: \( - 8{\left( { - 2x + 1} \right)^3}\) B: \(8{\left( { - 2x + 1} \right)^3}\) C: \(4{\left( { - 2x + 1} \right)^3}\) D: \(- 4{\left( { - 2x + 1} \right)^3}\)
函数\(y = {\left( { - 2x + 1} \right)^4}\)的导数为( ). A: \( - 8{\left( { - 2x + 1} \right)^3}\) B: \(8{\left( { - 2x + 1} \right)^3}\) C: \(4{\left( { - 2x + 1} \right)^3}\) D: \(- 4{\left( { - 2x + 1} \right)^3}\)
(3) A. right B. ride A: right B: ride
(3) A. right B. ride A: right B: ride
哪个公式的含义是“取A2单元格的右边3个字符”? A: RIGHT(A2,3) B: RIGHT(A3,2) C: RIGHT(A2:3) D: RIGHT(A3:2)
哪个公式的含义是“取A2单元格的右边3个字符”? A: RIGHT(A2,3) B: RIGHT(A3,2) C: RIGHT(A2:3) D: RIGHT(A3:2)
函数\(y = \cos (4 - 3x)\)的导数为( ). A: \( - 3\sin \left( {4 - 3x} \right)\) B: \(3\sin \left( {4 - 3x} \right)\) C: \(3\sin \left( {4 + 3x} \right)\) D: \( - 3\sin \left( {4 + 3x} \right)\)
函数\(y = \cos (4 - 3x)\)的导数为( ). A: \( - 3\sin \left( {4 - 3x} \right)\) B: \(3\sin \left( {4 - 3x} \right)\) C: \(3\sin \left( {4 + 3x} \right)\) D: \( - 3\sin \left( {4 + 3x} \right)\)
设 \( A \)是 \( 3 \times 3 \)矩阵, \( B \)是 \( 4 \times 4 \)矩阵,且\( \left| A \right| = 1,\,\left| B \right| = - 2, \) 则\( \left| {\left| B \right|A} \right| = \) ______
设 \( A \)是 \( 3 \times 3 \)矩阵, \( B \)是 \( 4 \times 4 \)矩阵,且\( \left| A \right| = 1,\,\left| B \right| = - 2, \) 则\( \left| {\left| B \right|A} \right| = \) ______
设\( A \) 是\( 3 \) 阶矩阵,且\( \left| A \right| = 3 \) ,则 \( \left| { - 3A} \right| = \)( ) A: -9 B: 9 C: -81 D: 81
设\( A \) 是\( 3 \) 阶矩阵,且\( \left| A \right| = 3 \) ,则 \( \left| { - 3A} \right| = \)( ) A: -9 B: 9 C: -81 D: 81
设 \( A \)为3阶方阵,已知 \( \left| A \right| = 2 \),则 \( \left| { { A^{\rm{*}}}} \right|{\rm{ = }} \)______
设 \( A \)为3阶方阵,已知 \( \left| A \right| = 2 \),则 \( \left| { { A^{\rm{*}}}} \right|{\rm{ = }} \)______
设\( A \)是3阶矩阵,若\( \left| {3A} \right| = 3 \),则\( \left| {2A} \right| = \)( ) A: 1 B: 2 C: \( {2 \over 3} \) D: \( {8 \over 9} \)
设\( A \)是3阶矩阵,若\( \left| {3A} \right| = 3 \),则\( \left| {2A} \right| = \)( ) A: 1 B: 2 C: \( {2 \over 3} \) D: \( {8 \over 9} \)
设\( {\alpha _1} = {\left( {1,2, - a, - 3} \right)^T},{\alpha _2} = {\left( { - 3,2,4,1} \right)^T} \)且\( \left( { { \alpha _1},{\alpha _2}} \right) = - 1 \),则\( a = \)( ) A: \( - {2 \over 3} \) B: \( - {3 \over 4} \) C: \( - {1 \over 4} \) D: \( {1 \over 2} \)
设\( {\alpha _1} = {\left( {1,2, - a, - 3} \right)^T},{\alpha _2} = {\left( { - 3,2,4,1} \right)^T} \)且\( \left( { { \alpha _1},{\alpha _2}} \right) = - 1 \),则\( a = \)( ) A: \( - {2 \over 3} \) B: \( - {3 \over 4} \) C: \( - {1 \over 4} \) D: \( {1 \over 2} \)
函数\( y = \left( {x - 4} \right)\root 3 \of { { {\left( {x + 1} \right)}^2}} \)的极大值为( )。 A: 0 B: 2 C: 3 D: 4
函数\( y = \left( {x - 4} \right)\root 3 \of { { {\left( {x + 1} \right)}^2}} \)的极大值为( )。 A: 0 B: 2 C: 3 D: 4