3x-1/4-1=2y+7/6
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
化简求值:(7x-2y)(3x-2y-1)-(4x+3y)(9x+6y),其中x=2,y=-1
不解方程组x+4y=6 x-3y=1求代数式7y(x-3y)的平方-2(3y-x)的立方
{4/(x+y)+6/(x-y)=3 {9/(x-y)-1/(x+y)=1
x+y=3 x+2y=9 3/x+1=y y-x=3 y=2x-3 y-3x=1 2(x+1)-y=6 7x-5y=-9
若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
1 .{5X-2y=3 X+6y=7 2.{5x+4y=-3 2x-3y=8 3.{x+Y+Z=26 x-Y=1 2x-
解二元一次方程{5X-2y=3 X+6y=7 {5x+4y=-3 2x-3y=8 {x+Y+Z=26 x-Y=1 2x-
函数的值域(1)y=3x (2)y=8/x (3)y=-4x+5 (4)y=x^2-6x+7 同志们 ...
3分之2(X-Y)-4分之X+Y=-1,6(X+Y)-4(2X-Y)=16
解方程组:2(x-y)/3-x+y/4=-1 ,6(x+y)-4(2x-y)=16