4(2y+3)=8(1-y)-5(y-2)
4(2y+3)=8(1-y)-5(y-2)
微分方程y''-3y'+2y=5,y(0)=1,y'(0)=2求解过程
已知:3x=8y.求(1)x+y/y (2)2x+3y/x-2y
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
2x^2y×(-8y^2)+4x^2y×5y^2
解方程组:(0.2x+0.1y)/2- (4x-y)/10=(x-y)/5+ (3x+0.5y)/30 (3x+2y-1
微分方程(1)(y'')^2+5y'-y+x=0;(2)y''+5y'+4y^2-8x=0;(3)(3x+2y)dx+(
已知3x=4Y,5Y=6Z,求 (1)x:y:z;(2)x+y/y+z.
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
化简求值:【(x+Y)(X-Y)-(X-Y)的平方+2Y(2-Y)】除4Y,其中X=1 Y=2
用加减消元法(1)2x-y=8 2x+5y=-4 (2)2x+5y=17 2x-3y=1 (3)x-y=5 2x+3y-
(1)5X+2Y=16,Y=1;(2)Y=3/4X,X-8Y=-15;(3)3分之2X+5Y=6分之X-2Y=2;(4)