怎么解3X+2Y=39,4X-3y=18这个方程

怎么解3X+2Y=39,4X-3y=18这个方程 2x=y 3y=x怎么解 3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y怎么解 x^2-4xy+3y^2=（x-3y)(x-y)x^2-4xy+3y^2 怎么分解成（x-3y)(x-y) (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= 推倒公式:(x+y)(x*x-3x+y*y)=x*x*x+y*y*y怎么做. 5x+4y=22 4x+y=3y+x 怎么解 二元一次方程(x+y)/2+(x-y)/3=6,4(x+y)-5(x-y)=2怎么算 3x*5y+2x*6y=2.7*(3x+2x)怎么解 {2X=5(X+Y)3X-10(X+Y)=2怎么解? X-Y=3 2X+4Y=18 X=? Y=?方程式怎么算呀 方程2x+y=3,4x-y=-1,6x+y+z=8怎么解 三元一次方程组x-2y=5,4x-y+3z,2x+y=0怎么解 解二元一次方程组：3(x+y)-4(x-y)=4,x+y/2+x-y/6+1x+y/2+x-y/6+1=1 x-3y=2 y=x 怎么写 2（x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15 x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20 {(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20