x﹣4y=16,3x+5y=﹣3 ,x,y等于什么?X减4y等于16,3x加5y等于负3 x,y各等于什么?

（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 化简（x+5y)(x+4y)-(x-5y）（x+5y）其中x=3y=﹣三分之一 （5x+3y)(3y-5x)-(4x-y)(4y+x)= 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 x﹣4y=16,3x+5y=﹣3 ,x,y等于什么?X减4y等于16,3x加5y等于负3 x,y各等于什么? 先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5 (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) 初二上学期方程题 4x+y=5 5x+4y=63x-2y=1 2x+3y=13x-2y=7 7x+5y=32x+3y=17 2x-y=-4x+5y=6 2x+y=23x-6y=4 3x+2y=52x+y=73x-4y=53x+y=1x-2y=-1x+y=42x+3y=92x-3y=74x+5y=3x+y=20004x+6y=90003x+5y=113x-2y=42x+3y=215x-2y=5x+y=54x+3y=182x+3y=16x+4y=132x+3y=40x 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1 3X=5Y （X+Y)*3X=(2Y+X)*4+2*2 (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian 推倒公式:(x+y)(x*x-3x+y*y)=x*x*x+y*y*y怎么做. （3x-y)(y+3x)-(4x-3y)（4x+3y)=? {3(x+y)+3(y+x)=1,3(x+y)+4(y-x)=-1