填空：（1）x2+2?x?2+______=（x+______）2；（2）x2-2?x?6+______=（x-______）2；（3）x2+10x+______=（x+______）2；（4）x2-8x+______=（x-______）2．

LINGO程序中， 对下列表达式程序编写正确的是[img=229x30]18034d61706c78d.png[/img] A: 98x1+277x2-x1^2-0.3x1x2-2x2^2 B: 98*x1+277*x2-x1^2-0.3*x1*x2-2*x2^2 C: 98*x1+277*x2-x1**2-0.3*x1*x2-2*x2**2 D: 98*x1+277*x2-x1**2-0.3*x1*x2-2*x2**2

LINGO程序中， 对下列表达式程序编写正确的是[img=229x30]18034d60a8de840.png[/img] A: 98x1+277x2-x1^2-0.3x1x2-2x2^2 B: 98*x1+277*x2-x1^2-0.3*x1*x2-2*x2^2 C: 98*x1+277*x2-x1**2-0.3*x1*x2-2*x2**2 D: 98*x1+277*x2-x1^2-0.3*x1x2-2*x2^2

函数y=x2-2的定义域是x∈R

设\(z = \int_ { { x^2}}^y { { e^t}\sin t} dt\)，则\({z_{xx}=}\) A: \(2{e^ { { x^2}}}\left[ {\left( {1 + 2{x^2}} \right)\sin {x^2} + 2{x^2}\cos {x^2}} \right]\) B: \( - 2{e^ { { x^2}}}\left[ {\left( {1 + 2{x^2}} \right)\sin {x^2} - 2{x^2}\cos {x^2}} \right]\) C: \( - 2{e^ { { x^2}}}\left[ {\left( {1 + 2{x^2}} \right)\sin {x^2} + 2{x^2}\cos {x^2}} \right]\) D: \( - 2{e^ { { x^2}}}\left[ {\left( {1 + 2{x^2}} \right)\cos {x^2} + 2{x^2}\sin {x^2}} \right]\)

求不定积分[img=132x48]17da6537fc8dad6.png[/img]； （ ） A: -(4*(cos(x/2)/2 + 2*sin(x/2)))/(17*exp(2*x)) B: (4*(sin(x/2)/2 + 2*sin(x/2)))/(17*exp(2*x)) C: (4*(cos(x/2)/2 + 2*sin(x/2)))/(17*exp(2*x)) D: (4*(cos(x/2)/2 + 2*cos(x/2)))/(17*exp(2*x))

与数学关系式[img=114x22]1803bce8722f322.png[/img]等价的C语言关系表达式是？ A: x < -2 && x > 2 B: x < -2 || x > 2 C: -2 < x < 2 D: !(-2 <= x <=2) E: !(-2 <=x && x <= 2) F: x < -2, x > 2

求函数[img=148x49]17da6537a5eee98.png[/img]的导数； ( ) A: 1/(x^2*(2/x^2 + 1)) B: -1/(x^2*(2/x^2 + 1)) C: (x^2*(2/x^2 + 1)) D: -1/(x^2*(2/x^2 + 1))+2/x^2 + 1

求函数[img=102x46]17da6537bc771a0.png[/img]的导数； ( ) A: -x/(a^2 - x^2)^(3/2) B: x/(a^2 - x^2)^(3/2) C: (a^2 - x^2)^(3/2)/x D: (a^2 - x^2)^(1/2)

求微分方程[img=101x35]17da5f15503f795.png[/img] 的通解,实验命令为(). A: dsolve(Dy+2*x*y=x*exp(-x^2))ans=C1*exp(-x^2) + (x^2*exp(-x^2))/2 B: dsolve('Dy+2*x*y=x*exp(-x^2)','x')ans=C1*exp(-x^2) + (x^2*exp(-x^2))/2 C: dsolve('Dy+2*x*y=x*exp(-x^2)')ans=C1*exp(-x^2) + (x^2*exp(-x^2))/2