5x-8y=4 -3x+y=-0.5 用一元二次方程解,要过程

(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x （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+y=1 ,xy=-6{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(x-y+2)(x+y)=0,x²+y²=8{(x+y)((x+y-1)=0,(x-y)(x-y-1)=0 （x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y 先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5 已知:3x-5y=0,求x/y,x-y/y,x-y/x 填空题 x+y/4=x-y/6=3x+12y+5/8 x= y= 3(2X+Y)+(2(2x-Y)=6 (8X+4y)-(10X-5Y)=2 x+y/2+x-y/3=6,4(x+y)-5(x-y)=2用加减消元法解方程组 (4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=? 1.{3x+2y=73x-4y+12 {x-6y=-23x+4y=53 {8x+3y+2=06x+5y+7=04 {2x-y=650%x+12.5%y=25%×35 {|x |+y=2|x |+2y=3希望可以有过程,用加减消元法谢谢了 3(x-5)-8y=-x-(-0.5y)=7,求x,y的值 方程组x-2y=8,3x-4y=5,x=?,y=? 化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1