{9x-11y+1=0,4x-5y-3=0
y-3x=2,y-5x=4,y-7x=6,y-9x=8,y-11x=0方程组,
(1){x+2y=0,3x+4y=6(2){5x+6y=16,7x-9y=5(3){9x-11y+1=0,4x-5y-3
求解 3x=6y-2 3x-4y=2 6x-3y=-5 4x-9y+1=0 4(2x+y)-5(2x-y)=3 2(2x
微分方程(1)(y'')^2+5y'-y+x=0;(2)y''+5y'+4y^2-8x=0;(3)(3x+2y)dx+(
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
x^2+y^2-4x-6y+13=0,求(2/3根号9x+y^2根号x/y^3)-x^2根号1/x-5x根号y/x)的值
已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值
已知X,Y,满足(X+3Y)(X-3Y)=-10(Y^2-6/5)和2X(Y-1)+4(1/2X-1)=0
{9x-11y+1=0,4x-5y-3=0
用代入消元法解方程组:{y=x+1,3x+4y=11 {x-5y=0,3x+2y=17 {5x-3y=-1,3x+y=5
1、3x+y=22 2、3x-2y=9 3、4x+3y=25 4、2y=7x+3 5、4x-3y=14 5-2y=0 x
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27