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已知:2x+y=6,x-3y=1 求7y(x-3y)(x-3y)-2(3y-x)(3y-x)
x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x
若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值
x+2y=2x+y+1=7x-y 求:2x-y?
(3x-y)^2+(3x+y)(3x-y),x=1,y=-2
{6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1
二元一次方程 :2(x+y)-(x-y)=3 (x+y)-2(x-y)=1
若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于
2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
变量x,y满足约束条件,x+y>=3,x-y>=-1,2x-y
(x-y)^2+(x+y)(x-y) 其中 X =3 Y=-1
(x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5)
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
若x-y=2(x+y),求代数式x-y/x+y+x+y/x-y求代数式 x+y分之x-y+x-y分之x+y 已知:y=ax的3次方+bx+3,当x=-1/2时,y=-7,试求x=1/2时,y的值
若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
x-y/7 - x+y/10 =1/2 2(x-y)-5(x+y)=3修改、、、、(x-y)/7-(x+y)/10=1/2 2(x-y)-5(x+y)=3
{(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=?