(1){(3x-2)/4+(2y-1)/5=2 {(2x+2)/4(3y+2)/5=0 (2){(x+y)/2+(x-y

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(1){(3x-2)/4+(2y-1)/5=2 {(2x+2)/4(3y+2)/5=0 (2){(x+y)/2+(x-y)/3=6 {2(x+y)-3x+3y=24
(1){(3x-2)/4+(2y-1)/5=2
{(2x+2)/4(3y+2)/5=0
(2){(x+y)/2+(x-y)/3=6
{2(x+y)-3x+3y=24
(3){2x+3y=m
{3x+5y=m+2的解满足x+y=2求m
(1){(3x-2)/4+(2y-1)/5=2
{(2x+2)/4-(3y+2)/5=0
(2){(x+y)/2+(x-y)/3=6
{2(x+y)-3x+3y=24
(3){2x+3y=m
{3x+5y=m+2的解满足x+y=2求m

(1){(3x-2)/4+(2y-1)/5=2 {5(3x-2)+4(2y-1)=40 {15x-10+8y-4=40 {15x+8y=54（a）
{(2x+2)/4-(3y+2)/5=0 {5(x+1)-2(3y+2)=0 {5x+5-6y-4=0 {5x-6y=-1 （b）
b*3得到：15x-18y=-3 所以15x=18y-3（c）代入（a）得：（18y-3）+8y=54 所以：26y=57故y=57/26代入（c）得：15x=18*57/26-3所以x=474/195因此：{x=474/195
{ y=57/26

化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-( 先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y （x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3) {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 3x-2y=1 4x-5y 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 化简求值{(x=2y)(5x-2y)-(3x+2y)(3x-2y)]/4x,其中x=2,y=-1 已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y