A: [img=20x18]1803857285384a2.png[/img]
B: [img=11x14]180385728e8d3df.png[/img]
C: [img=20x18]18038572976c256.png[/img]
D: [img=20x18]180385729f4dc3a.png[/img]
E: [img=22x43]18038572a7a49c9.png[/img]
F: [img=22x43]18038572b028070.png[/img]
G: [img=22x43]18038572b901755.png[/img]
举一反三
- 空间物体[img=13x19]18030f9805beded.png[/img]由曲面[img=138x30]18030f980d51367.png[/img]与曲面[img=107x30]18030f98157f989.png[/img]所围，密度为[img=99x25]18030f981df1310.png[/img]，则它的质量为 A: [img=20x18]18030f98268800b.png[/img] B: [img=11x14]18030f982ebb72b.png[/img] C: [img=20x18]18030f9837205fa.png[/img] D: [img=20x18]18030f983f9ee4d.png[/img] E: [img=22x43]18030f984c06ca2.png[/img] F: [img=22x43]18030f98541f0e5.png[/img] G: [img=22x43]18030f985cc3014.png[/img]
- 空间物体[img=13x19]18030f99d241214.png[/img]由曲面[img=138x30]18030f99da4e6a8.png[/img]与曲面[img=107x30]18030f99e274b74.png[/img]所围，密度为[img=99x25]18030f99eb277ec.png[/img]，则它的质量为 A: [img=20x18]18030f99f3b975c.png[/img] B: [img=11x14]18030f99fbf7f94.png[/img] C: [img=20x18]18030f9a030a4e3.png[/img] D: [img=20x18]18030f9a0ab7c36.png[/img] E: [img=22x43]18030f9a130ef25.png[/img] F: [img=22x43]18030f9a1c05ad9.png[/img] G: [img=22x43]18030f9a241930f.png[/img]
- 空间物体[img=13x19]180322a81176f06.png[/img]由曲面[img=138x30]180322a819aa174.png[/img]与曲面[img=107x30]180322a82217477.png[/img]所围，密度为[img=99x25]180322a82adc415.png[/img]，则它的质量为 A: [img=20x18]180322a8342c5a9.png[/img] B: [img=11x14]180322a83d2690f.png[/img] C: [img=20x18]180322a844fda1d.png[/img] D: [img=20x18]180322a84d76823.png[/img] E: [img=22x43]180322a85697243.png[/img] F: [img=22x43]180322a85f9c593.png[/img] G: [img=22x43]180322a8676a528.png[/img]
- X为随机变量，E(X)=-1，D(X)=3，则E(3[img=24x22]1803da40b5dbfd6.png[/img]+20)=( ) A: 18 B: 9 C: 30 D: 32
- X为随机变量，E(X)=-1，D(X)=3，则E(3[img=24x22]1803da40ac7a8ce.png[/img]+20)=( ) A: 18 B: 9 C: 30 D: 32
内容
- 0
X为随机变量，E(X)=-1，D(X)=3，则E(3[img=24x22]1803381b293bffb.png[/img]+20)=( ) A: 18 B: 9 C: 30 D: 32
- 1
X为随机变量，E(X)=-1，D(X)=3，则E(3[img=24x22]17de66bf652c147.png[/img]+20)=( ) A: 18 B: 9 C: 30 D: 32
- 2
令F(x):x是有理数,G(x):x是实数。将命题“所有的有理数都是实数,但有的有实数不是有理数”符号化为() 未知类型：{'options': ['17e0a83a4157352.jpgx(F(x)∧G(x))∧[img=8x14]17e0a83a35505d4.jpg[/img]x(G(x)[img=14x9]17e0a73094b5dcf.jpg[/img][img=10x11]17e0a839b915354.jpg[/img]F(x))', ' [img=8x14]17e0a83a4157352.jpg[/img]x(F(x)[img=14x9]17e0a73094b5dcf.jpg[/img]G(x))∧[img=8x14]17e0a83a35505d4.jpg[/img]x(G(x)∧[img=10x11]17e0a839b915354.jpg[/img]F(x))', ' [img=8x14]17e0a83a4157352.jpg[/img]x(F(x)∧G(x))∧[img=8x14]17e0a83a35505d4.jpg[/img]x(G(x)∧[img=10x11]17e0a839b915354.jpg[/img]F(x))', ' [img=8x14]17e0a83a4157352.jpg[/img]x(F(x)[img=14x9]17e0a73094b5dcf.jpg[/img]G(x))∧[img=8x14]17e0a83a35505d4.jpg[/img]x(G(x)[img=14x9]17e0a73094b5dcf.jpg[/img][img=10x11]17e0a839b915354.jpg[/img]F(x))'], 'type': 102}
- 3
由曲面[img=107x30]18031ae499f7dbd.png[/img]与曲面z=[img=119x26]18031ae4a28d643.png[/img]所围立体体积等于（ ） A: [img=11x14]18031ae4aaf4c6e.png[/img] B: [img=22x43]18031ae4b2322d3.png[/img] C: [img=20x18]18031ae4bac58d5.png[/img] D: [img=22x43]18031ae4c2973d5.png[/img]
- 4
由y=1/x,y=4x,y=0,x=2所围成图形绕x轴旋转成的旋转体体积 A: [img=31x43]1803c4137ccd13d.png[/img] B: [img=22x43]1803c4138458ff1.png[/img] C: [img=22x43]1803c4138c13df6.png[/img] D: [img=31x43]1803c41393e9fa9.png[/img]