Which is the correct operator for power(Xy)? ( )
A: X^y
B: Xy
C: X^^y
D: None of the mentioned
A: X^y
B: Xy
C: X^^y
D: None of the mentioned
举一反三
- Which is the correct operator for power(Xy)? ( ) A: X^^y B: X^y C: None of the mentioned D: X**y
- 分解因式()x()3()y()-()2()x()2()y()2()+()xy()3()正确的是A.()xy()(()x()+()y())()2()B.()xy()(()x()2()﹣()2()xy()+()y()2())()C.()xy()(()x()2()+2()xy()﹣()y()2())()D.()xy()(()x()﹣()y())()2
- 设\(z = {e^u}\sin v,\;u = xy,\;v = x + y\)，则\( { { \partial z} \over {\partial y}}=\)( ) A: \(x{e^{xy}}\sin \left( {x + y} \right) + {e^{xy}}\cos \left( {x + y} \right)\) B: \(x{e^{xy}}\sin \left( {x + y} \right) \) C: \( {e^{xy}}\cos \left( {x + y} \right)\) D: \(x{e^{xy}}\sin \left( {x + y} \right) - {e^{xy}}\cos \left( {x + y} \right)\)
- 在下图中，已知斜截面上无应力，该x、y面上的应力分量满足关系 （ ）[img=363x330]1803be4a6959759.png[/img] A: σx>σy, τyx>τxy B: σx<σy, τxy=τxy C: σx>σy, τyx=τxy D: σx<σy, τyx>τxy
- 下列微分方程中，( )是齐次方程。 A: \( xy' = y(\ln y - \ln x) \) B: \( xy' + {y \over x} - x = 0 \) C: \( y' + {y \over x} = {1 \over { { x^2}}} \) D: \( y - y' = 1 + xy' \)