4x+1.6=4x-32%x=1.710:x=:.
举一反三
- 求微分方程[img=364x55]17da65386dfd612.png[/img]的通解; ( ) A: - cos(2*x)*exp(x)*(x/4 - sin(4*x)/16) + C23*cos(2*x)*exp(x) + C24*sin(2*x)*exp(x) B: (3*sin(2*x)*exp(x))/32 - (sin(6*x)*exp(x))/32 - cos(2*x)*exp(x)*(x/4 - sin(4*x)/16) + C23*cos(2*x)*exp(x) + C24*sin(2*x)*exp(x) C: - sin(4*x)/16) + C23*cos(2*x)*exp(x) + C24*sin(2*x)*exp(x) D: (sin(6*x)*exp(x))/32 - cos(2*x)*exp(x)*(x/4 - sin(4*x)/16) + C23*cos(2*x)*exp(x) + C24*sin(2*x)*exp(x)
- 求不定积分[img=112x35]17da6538063a9e4.png[/img]; ( ) A: (x^4*log(x)^2)/4 + (x^4*(log(x) - 1/4))/ B: (x^4*log(x)^2)/4 - (x^4*(log(x) - 1/4))/8 C: (x^4*log(x)^2)/4 - (x^4*(log(x) - 1/4)) D: (x^4*log(x)^2)/4 + (x^4*(log(x) - 1/4))/8
- A={X|X≤1},B={X|X>-4},则A∩B=__________. A: {X|X≤1} B: {X|x>-4} C: {X|-4
- 执行int x,y,z.k;x=(y=4,z=16,k=32)后,x的值是() A: 4 B: 16 C: 32 D: 52
- 向量X= (1,2,3,4,5,6,7,8,9,10),删除向量X的第3个元素的命令是 A: X<-X<-4> B: X<-X (4) C: X<-X (-4) D: X<-X [-4]