5X+y=2,X-3y=4的解,

求5x-2y=x-y=4x-3y-2的解 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 关于X,Y的方程组3X+2Y=2m+5与x-y=4m-5的解x,y满足x+2y 二元一次方程组的解.2X-4Y=6 3X+2Y=172X+3Y=73X-5Y=13Y=X+52X+5Y=233X+5Y= 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 5x+6y+3x-4y+3-x+x =5x+3x-x+x+6y-4y+3 =8x=2y+3 谁能告诉我这题合并同类项的解 1.已知:x-2y=3,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除4x 的值 已知x-2y=2011,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷4x的值. 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 解方程组 解方程x+y+(x+y/2)=15 3x+5y+4(x+y/2)=62 解方程组 {(x+y)/2+(x-y)/3=6 5(x+y)-2(x-y)=4 解方程组 X+Y/2+X-Y/3=6 4[X+Y]-5[X-Y]=2