y=arctan1 x-3
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/10 08:58:09
移项、得1.5y=-3系数化为一、y=-2很简单的呀
函数y=3sinx+cosx=2sin(x+π6)∵x∈[−π2,π2]∴-π3≤x+π6≤2π3∴-3≤2sin(x+π6)≤2故函数y=3sinx+cosx,x∈[−π2,π2]的值域[-3,2]
3(x+y)+3(y-x)=1(1)3(x+y)+4(y-x)=-1(2)(2)-(1)得y-x=-2(3)代入(1)3(x+y)-6=1x+y=7/3=>x=7/3-y又由(3)得x=y+2y+2=
∵3y^2-(2y+1)(y-2)=(y-5)(y-1)==>3y^2-2y^2+3y+2=y^2-6y+5==>9y==3==>y=1/3∴原方程的解是y=1/3.
=-(xy^2)^4+3(xy^2)^3+(xy^2)^2=-27-27-3=-57
x=5y=-2
y^4-(3y-2)^2=y^4-9y^29y^2=(3y-2)^23y=3y-23y=-(3y-2)无解y=1/3
8y-3=5y+38y-5y=3+33y=6y=2
X+Y分之X-Y等于3x=-2yX+Y分之2(x-y)减X+Y分之3X+Y=(-x-3y)/(x+y)=1
1.齐次通解Y特征方程为:r²-3r+2=0(r-1)(r-2)=0r=1或r=2Y=C1e^x+C2e^2x2.非齐次特解y*设y*=ay*'=y*''=02a=5a=5/2所以通解为:y
因为(x-y)/(x+y)=3,则(x+y)/(x-y)=1/3则5(x-y)(x+y)-(x+y)/2(x-y)=5*3-1/(3*2)=15-1/6=89/6
11y-12-2y²=y²-7y+10-(3y²-7)18y=12+10+7=39y=39/18
特征方程y=e^pp^2-3p=0p=0,p=3于是p=0y=cc是任意常数p=3y=e^3x+cc是任意常数再问:最后答案是y=e^3x+cc是任意常数吗??e^是什么意思?再答:e^p就是e的p次
齐次方程:r^2+2r-3=0r=-3orr=1通解为C1e^(-3x)+C2e^x
特征方程为r²+r+2=0,则r=(-1±√7i)/2∴a=-1/2,b=√7/2∴齐次方程的通解为Y=e^(-x/2)[C1cos(√7x/2)+C2sin(√7x/2)]再求非其次方程的
x*y^2(dy/dx)=1+x把x移到右边变成y^2dy=(1+x)/xdx两边同时积分y^3/3=x+lnx+A.A是常数为了确定这个常数,代入初值y(1)=4、A=61/3这个函数是y^3=3(
∵3y^2-(2y+1)(y-2)=(y-5)(y-1)==>3y^2-2y^2+3y+2=y^2-6y+5==>9y==3==>y=1/3∴原方程的解是y=1/3.希望对你有所帮助,
(x+y^2+3)dy=(x-y+1)dx或:xdy+ydx+(y^2+3)dy-(x+1)dx=d(xy)+(y^2+3)dy-(x+1)dx=0通解为:xy+y^3/3+3y-x^2/2-x=C