Thursday, March 23, 2023
问题:方程y″+16y=sin(4x+a)(a是常数)的特解形式为y*=____。...
Monday, September 19, 2022
问题:微分方程y″+ay′+by=cex的一个特解为y=e2x+(1+x)ex,求a,b,c及方程的通解。...
Saturday, September 17, 2022
问题:设A、B、C均为n阶方阵,若A=CTBC,且|B|<0,则|A|____。...
Wednesday, September 21, 2022
Wednesday, September 21, 2022
问题:已知f(x)=x3+ax2+bx在x=1处取得极小值-2,则a=____,b=____。...
Wednesday, September 21, 2022
问题:单选题设函数f(x)=x2(x-1)(x-2),则f′(x)的零点个数为( )。A 0B 1C 2D 3...
Friday, August 25, 2023
问题:设A为n阶方阵,若对任意n维向量x(→)=(x1,x2,…,xn)T都有Ax(→)=0。证明:A=0。...
Wednesday, September 14, 2022
问题:填空题方程dy/dx+y=y2的通解为____。...
Sunday, August 20, 2023
问题:曲线y=y(x)经过原点且在原点处的切线与直线2x+y=6平行,而y=y(x)满足方程y″-2y′+5y=0,则此曲线的...
Wednesday, September 14, 2022
问题:填空题一袋中有50个乒乓球,其中20个红球,30个白球,今两人从袋中各取一球,取后不放回,则第二个人取到红球的概率为____。...
Wednesday, December 14, 2022
问题:问答题已知A3=2E,且B=A2-2A+2E。求B-1。...
Friday, February 10, 2023
问题:填空题设两两相互独立的三个事件A、B、C满足条件ABC=∅,P(A)=P(B)=P(C)<1/2,且已知P(A∪B∪C)=9/16,则P(A)=____。...
Thursday, July 20, 2023
问题:差分方程2yt+1+10yt-5t=0的通解为____。...
Wednesday, September 21, 2022
问题:微分方程y″+[2/(1-y)](y′)2=0的通解为____。...
Saturday, September 17, 2022
问题:设两个相互独立的随机变盘X和Y分别服从于N(0,1)和N(1,12),则( )....
Wednesday, September 21, 2022
问题:问答题设在[0,+∞]上函数f(x)有连续导数,且f′(x)≥k>0,f(0)<0,证明:在(0,+∞]内有且仅有一个零点。...
Friday, February 9, 2024
问题:设函数y=1/(2x+3),则y(n)(0)=____。...
Monday, September 19, 2022