3x-5y=14y-9x=-14

6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 （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 解方程组 (x+y)^2-3(x+y)=54 (x-y)^2-5(x-y)=14 4x-2*(10-x)-10=5y-3*(10-y)x+y=14 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 1:4(x-100)+3y=5 2:6(x-y)-2(x+y )=14 x-100=-y 3(x-y)+(x+y)=5 先无视上面的1.4(x-100)+3y=5x-100=-y2.6(x-y)-2(x+y )=143(x-y)+(x+y)=5 用代入法解下列方程组 ①｛y=1-x 3x+2y=5 ②｛2x-y=5 3x+4y=2 ③｛x-y-3=0 3x-8y=14 ④｛④｛2x-7y=8 3x-8y-10=0⑤｛x=3y+7/2 x=2y+8/3⑥｛3x=5y 4y-3x+9=0急 三元一次方程组,1.x-2y+z=9 2x+y+3z=10 3x+2y1.x-2y+z=92x+y+3z=103x+2y-z2.3x-5y+2z=14x+5y-z=5X-5y+3z=-23.7x+2y-z=76x-y+z=74x+3y+z=94.4x+3y-2z=-75x-6y+z=12x+z=-25.2x+3y-4z=-23x-2y+5z=262x+5z=31 若(-x+6):(x-y):(4x+y)=3:14:1,求x+y 若(-x+6):(x-y):(4x+y)=3:14:1,求x+y (-x+6):(x-y);(4x+y)=3;14:1,求x+y的值. 5x=3y,(2x+y)的平方=5x(x+y)+9 解数学二元次方程组x=2y-1,2x+4y=942x+y=9,2x-y=-52x-3y=5,x+2y=63分之一x-y=5,4分之一x-y=1x+2y=0,2x-y=53x+2y=4,5x-4y=14x+2y=2,2x-3y=-32x+3y=0,3x+2y=5我实在是不会,有些地方还是不懂,大家能做多少就 作多少,大家行行 3x-2y=9 x-3y=2 x+y=5 x+2y=3 y=x 2x+y=8 y=5;x=14;y=((x=3*y,x=6),x-1);printf(x=%d,y=%dx, 例X=1 y=21.X+Y=5 X-Y=15 2.2X+3Y=4 5X+6Y=7 3.X+3Y=5 3X+Y=-1 4.2X+Y=3 3X+5Y=11 5.4X+3Y=6 2X+Y=4 6.X+Y=180 X=3Y-10 7.3X-2Y=3 2X-Y=7 8.5X+3Y=7Y X+Y=45 9.3X+4Y=126X+8Y=24 X:6Y=1:4 10.X+Y=138 X-45=Y+53 11.X+Y=60 14Y=20X 12.2X+3Y=15.5 5X+6Y=35 13.X+Y=170 3