(2y-1)÷6-(4y+1)÷8=1

y (3y^2+8y-3)-6y(3y+2y-1)+9y 4y²-4y/y²-2y+1÷(y+1/y-1-y-1/y+1)÷(3y+3) (x+y)(x-y)+(x-y)^2-(6x^2×y÷2y-2xy^2÷2y)其中x=-3,y=1/3 已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值 [T,Y]=ode45(@rigid,[0 1],[rand(15,1)]);plot(T,Y(:,1),'-',T,Y(:,2),'-.',T,Y(:,3),'.',T,Y(:,4),'-',T,Y(:,5),'-.',T,Y(:,6),'.',T,Y(:,7),'-',T,Y(:,8),'-.',T,Y(:,9),'.',T,Y(:,10),'-',T,Y(:,11),'-.',T,Y(:,12),'-.',T,Y(:,13),'.',T,Y(:,14),'-',T,Y(:,15),'.') 5y-4÷2y-4+1÷2=2y+5÷(3y-6)解方程 [(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y 已知x^2-8x+y^2-y+16又1/4=0,求[(x+y)(x-y)-(x+y)^2-2y(x-3y)]÷4y的值 y- 2y+1/2=9- 8-y/4 y-2y+1/2=9-8-y/4 2-（4-y)=6y-2（y+1) 2-(4-y)=6y-2(y+1) y-2[y-4(y-1)]-8=0 (y+2)÷4-(2y-3)÷6=1 求y的值 已知：【（x²+y²）-（x-y)²+2y（x-y)】÷4y=,求4x/（4²-y²）-1/（2x+y)的值已知：【（x²+y²）-（x-y)²+2y（x-y)】÷4y=1，求4x/（4²-y²）-1/（2x+y)的值 [(x+3y)(x-3y)-6分之1(2x-3y)(3x+6y)]÷(4分之1y)其中x=-2y=8分之1 计算.2x÷x/5x+3y^2-4y+4/2y-6·1/y+3÷12-6y/9-y^2 常微分方程的通解dy/dx=(x-y+1)/(x+y-3)y^4=2y^n+y=0y''+6y'+9y=e^(-3x)y''+y'-2y=4e^(2x)