0.4x+0.3y=2.4 (x-3)/3=(y+6)/5

(3x-1)/2 - (x-y)/3=1 0.4x +0.3y=2.4 { { (x-y)/4 + (x+2y)/3=1 (x-3)/3=(y+6)/5求以上两个方程组的解,急.(3x-1)/2 - (x-y)/3=1{ 0.4x +0.3y=2.4 (x-y)/4 + (x+2y)/3=1 {(x-3)/3=(y+6)/5 解方程组0.4x+0.3y=2.4 x-3/3 =y+6/5 0.4x+0.3y=2.4 (x-3)/3=(y+6)/5 推倒公式:(x+y)(x*x-3x+y*y)=x*x*x+y*y*y怎么做. （x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y 已知:3x-5y=0,求x/y,x-y/y,x-y/x 3^x+2x=y,x (x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一 (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 二元一次方乘0.4x+0.3y=2.4(x-3)/3=(y+6)/5求x和y 化简 x-y/(y-x)^3= (x+y)(2x-3y)=? 3(x+y)+2(x-y)=20 0.3x+0.6y=60 x=?y=? 用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+. 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 方程组0.3y+0.4x=2.4 3分之x-3等于5分之y+6怎么解 y(x+y)+(x-y)²-（x+y）（x-y）,其中x=-1/3,y=3