1.{x=y-3 {2x+y=13 2.{x+y=11 {3x-2y=83.{8x+5y=10 {3x-5y=12 4.{3x+2y=20 {4x-5y=19
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1.{x=y-3 {2x+y=13 2.{x+y=11 {3x-2y=83.{8x+5y=10 {3x-5y=12 4.{3x+2y=20 {4x-5y=19
1.{x=y-3 {2x+y=13 2.{x+y=11 {3x-2y=8
3.{8x+5y=10 {3x-5y=12
4.{3x+2y=20 {4x-5y=19
1.{x=y-3 {2x+y=13 2.{x+y=11 {3x-2y=83.{8x+5y=10 {3x-5y=12 4.{3x+2y=20 {4x-5y=19
x=10/3,y=19/3
x=6,y=5
x=2,y=-6/5
x=6,y=1
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
x^2-y分之y(x-y)-x(x+y)除以x+y分之x^2+y^2.其中x=2,y=-1.先化简再求值.
1.(X-Y)/13=Y/7问(x+y)/y=?.2.x/6=y/4=z/3(x.z.y不为0)则(X+3Y)/3Y-2Z=?
{(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=?
结果用幂的形式表示:1.(x-y)^2(y-x)= 2.(x-y)^2(y-)^2= 3.(x-y)^2(y-x)^3= 4.(x-y)^3(y-x)=
(x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
1.已知二元一次方程3X+4Y=6,当X,Y互为相反数,X=?Y=?当X与Y相等,X=?Y=?2.{Y=3/2X 3{3X-Y=5 4.{5X+Y=32X+8Y=22 5X+3Y-13=0 2X+3Y=-10.55.{X+1=5(Y+2)3(2X-5)-4(3Y+4)=53-5题用代入法解方程组2.{Y=3/2X 2X+8Y=223{3X-Y=55X+3Y-13=0
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
(x+y)(2x-3y)=?
三元一次方程解 1.{x+y-z=5 {3x+2y+z=2 {2x-2y+z=-31.{x+y-z=5 2.{9x-5y+x=-6 3.{x-y=3 4.{x+y=3 5.{4x-2y+z=7{3x+2y+z=2 {9x+y-2z=3 {x+z=7 {y+z=4 {2x-y-3z=28{2x-2y+z=-3 {-9x+3y-5z=0 {y-z=6 {z+x=5 {x+y-2z=13
1.当x-3y=2,3x-3y=4z.则x:y:z=( )2.若|3x+2y-13|=-(2x-4y+z)^2,则x+y=( )对不起,打错了应为1.当x-3y=z,3x-3y=4z.则x:y:z=( ) 2.若|3x+2y-13|=-(2x-4y+2)^2,则x+y=( )
解下列不等式组用加减法1.{3x+5y=-2 3x-y=4 2.{x-2y=8 3x+2y=163.{二分之三x+2y=1 二分之三x-y=-54.{3x-2y=8 3x+2y=165.{5x+6y=13 7x+18y=-16.{二分之一x+3y=7 2x-5y=-6
解方程组 1.(3x-13y=-16 x+3y=2) 2.(2x+3y=1 5x-6y=7
1.X-3=Y+4 x=3Y 2.x-2y=3 3x-8y=13 老师
1.(2x-3y)(2x+3y)=2.(5x+3y)(3y-5x)3.(x-3y)(-x+3y)=4.(x+y-z)²=
(x+2y)(x-2y)-(2x-y)的平方+(3x-y)(2x-5y)其中x=-1 y=13分之1
先化简再求值:(x+y)(x-y)+(x^2-2xy+y^2)-(x^2y)^3÷(x^2y)^2,其中x=1,y=2.