1.{2X-3Y=8 2.{9X+8Y=-2 3.{3(x-1)=Y+5{3X+7Y=0.5 {4X+5y=-11 {5(y-1)=3(X+5)4.{3分之2U+4分之3V=2分之1{5分之4U+6分之5V=15分之7
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【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
9y=3x-(x-1),4(x+y)-(2x+4)=8y
3x-2y=9 x-3y=2 x+y=5 x+2y=3 y=x 2x+y=8
12y(x-y)^2-8(x-y)^3=?
方程组1.{x+y+1=0,x^2+4y^2=8 2.{(x-3)^2+y^2=9,x+2y=0 3.{x+y=6,xy=7方程组1.{x+y+1=0,x^2+4y^2=8 2.{(x-3)^2+y^2=9,x+2y=03.{x+y=6,xy=7方程组1.{x+y+1=0,x^2+4y^2=8 2.{(x-3)^2+y^2=9,x+2y=0 3.{x+y=6,xy=7
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2)/2(x-y)^2
1.(-2a)³·b²÷(8a³b²) 2.-5x(2x²-3x+4)+4x³+15x3.(x²-2y²)(x+2y)-2xy(x-y)4.(x-y+z)(x-y-z)化简求值 [(x+y)(x-y)-(x+y)²-2y(x-2y)]÷(-2y),其中x=5,y=2003
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
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
(x+y)+(2x+1/1*2y)+(3x+1/2*3y)+.+(9x+1/8*9y) x=2 y=90求和
3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y 联立方程 有的话
3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y
3x+2=y 5X+4=Y 7X+6=Y 9X+8=y 11x=y要如何计算
3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y怎么解
y-3x=2,y-5x=4,y-7x=6,y-9x=8,y-11x=0方程组,无
化简(x+y)+(2x+1/2y)+(3x+2/3y)+(4x+3/4y)+...+(9x+8/9y)=?
化简:(-4x+3y)(-3y-4x)-(2x+3y)(8x-9y),其中,x=-3,y=-2
已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX..