写出下列产物生成的过程,并说明其原因。[img=392x122]17a4b27f41d8631.png[/img][img=361x128]17a4b28266c939d.png[/img]
举一反三
- 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))
- 随机变量X服从正态分布N(2, 4),其概率密度f(x) = ( ). A: [img=191x60]1802f2ad96fdbf7.png[/img] B: [img=220x63]1802f2ada0bf186.png[/img] C: [img=221x63]1802f2adabac400.png[/img] D: [img=212x57]1802f2adb8ce515.png[/img]
- 随机变量X服从正态分布N(2, 4),其概率密度f(x) = ( ). A: [img=191x60]1802f2aae5be86e.png[/img] B: [img=220x63]1802f2aaefb9a64.png[/img] C: [img=221x63]1802f2aafa6bb41.png[/img] D: [img=212x57]1802f2ab04ebe63.png[/img]
- 随机变量X服从正态分布N(2, 4),其概率密度f(x) = ( ). A: [img=191x60]1802f2c48daf2cd.png[/img] B: [img=220x63]1802f2c497e7d97.png[/img] C: [img=221x63]1802f2c4a2253a6.png[/img] D: [img=212x57]1802f2c4acda7d1.png[/img]
- 设[img=127x53]17f1b3d6db98b83.jpg[/img],f(x)=arctanΧ,则[img=56x55]17f1b3d82842941.jpg[/img]=()。 A: π B: 3π/4 C: -3π/4 D: 2π