5x-8y=12

填空题 x+y/4=x-y/6=3x+12y+5/8 x= y= 12y(x-y)^2-8(x-y)^3=? 解一些方程组8(1/x+1/y)=16/x+x/y=19/(x+y)+6/(x-y)=312(x+y)=12(x-y)-11/(2x+y)-1/(x-2y)=53/(2x+y)-2/(x-2y)=5过程可以省略. 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 请解答方程组：（39）2x+y=5 (40)x+y=7 (41)2x+3y=12 (42)2x+y=3ax+3y=7 2x-y=8 3x+4y=17 3x-5y=11(43)3x+y=82 (44)3(x-1)=y+5 45 x/4+y/3=7 (46)x+y/3 +x-y/2=610x-11y=87 5(y-1)=3(x+5) 2/3x+y/2=14 3(x+y-)2(x-y)=28 (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian Y-X=45 (85%Y-X)×8=(Y-35-X)×12 Y-X=45 (85%Y-X)×8=(Y-35-X)×12 3x-2y=9 x-3y=2 x+y=5 x+2y=3 y=x 2x+y=8 解方程组 2x-y=5 2y/x-x/y=12x-y=52y/x-x/y=1 x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x 已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值 已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值 方程组 (1)x+3y-z=2 (2)5x+y=8 (3)x+y+z=12 5x-8y=12 -6x(2/3x-2/5y)+12y(-3/8x+1/3y)=? 用加减消元法解下列方程组,1.{9+2y=-1,9x-3y=92.11+5y=-28,2x+5y=-13.{8x-3y=12,2x+5y=264.{2x+3y=1,3x-5y=685.{6x+y=5,6x-y=3 方程组 ｛5x+8y+12z=100 x+y+z=14 方程组｛5x+8y+12z=100x+y+z=14 ①x+y+z=6 3x-y+2z=12 x-y-3z=-4 ②x+y-z=2 4x-2y+3y+8=0 x+3y-2z-6=0③x/3=y/2 y/4=z/5 x+y+z=60三元一次方程