a)\(A=x^3+x^2y-xy-y^2+3y+x-1\)

               Ta có:\(x+y-2=0\Rightarrow x+y=2\)

  \(A=x^2\left(x+y\right)-y\left(x+y\right)+3y+x-1\)

     \(=2x^2-2y+3y+x-1\)

     \(=2x^2+y+x-1\)

     \(=2x^2+2-1\)

    \(=2x^2+1\)

b) x - y = 0 => x = y

B = x( x^2 + y^2 ) - y ( x^2 + y^2 ) + 3

= x(x^2 + x^2 ) - x (x^2 + x^2 ) + 3

= 3

C = \(x^3\) + \(x^2\).y - 2\(x^2\) - \(xy\) - y\(^2\) + 3y + \(x\) - 1

C = (\(x^3\) + \(x^2\).y - 2\(x^2\)) - (\(xy\) + y\(^2\) - 2y) + (y + \(x\) - 2) + 1

C = \(x^2\).(\(x\) + y - 2) - y(\(x\) + y - 2) + (y + \(x\) - 2) + 1 (1)

Thay \(x+y-2\) vào biểu thức (1) ta có:

C = \(x^2\). 0 - y . 0 + 0 + 1

C = 0 - 0 + 0 + 1

C = 1

a)   \(A=x^3-x^2y+3x^2-xy+y^2-4y+x+2\)

\(=\left(x^3-x^2y+3\right)-\left(xy-y^2+3y\right)+\left(x-y+3\right)-1\)

\(=x^2\left(x-y+3\right)-y\left(x-y+3\right)+\left(x-y+3\right)-1\)

\(=\left(x-y+3\right)\left(x^2-y+1\right)-1\)

\(=-1\)         (thay  x - y + 3 = 0)

x+y+1=0 suy ra x+y=1

Làm câu A nhé B,C tương tự

A= x^2.(x+y-2)-(xy+y^2-2y)+(y+x-1)=0-y.(x+y-2)+1=1

Hok tốt

xin lỗi nha x+y=-1 nhé

C = \(x^3\) + \(x^2\).y - 2\(x^2\) - \(xy\) - y\(^2\) + 3y + \(x\) - 1

C = (\(x^3\) + \(x^2\).y - 2\(x^2\)) - (\(xy\) + y\(^2\) - 2y) + (y + \(x\) - 2) + 1

C = \(x^2\).(\(x\) + y - 2) - y(\(x\) + y - 2) + (y + \(x\) - 2) + 1 (1)

Thay \(x+y-2\) vào biểu thức (1) ta có:

C = \(x^2\). 0 - y . 0 + 0 + 1

C = 0 - 0 + 0 + 1

C = 1

D = \(x\).(\(x^3\) - y)(\(x^3\) - 2y\(^2\))(\(x^3\) - 3y\(^2\))(\(x^3\) - 4y\(^4\)) (1)

Thay \(x\) = 2 và y = - 2 vào biểu thức (1) ta có:

D = 2.(2\(^3\)+2).(2\(^3\)- 2.(-2\()^2\)).(2\(^3\)-3(-2)\(^2\))(2\(^3\)- 4.(-2)\(^4\))

D = 2.(2\(^3\)+ 2).(8 - 8).(2\(^3\)- 3(-2)\(^2\))(2\(^3\)- 4.(-2)\(^4\))

D = 2.(2\(^3\)+ 2).0.(2\(^3\)- 3(-2)\(^2\))(2\(^3\)- 4.(-2)\(^4\))

D = 0

a.x³(x+y) - y³(x+y)-1 = -1

ngu vậy cái này mà cũng hỏi à

P = \(\left(x^4+x^3y-2x^3\right)+\left(x^3y+x^2y^2-2x^2y\right)-\left(x^2+xy-2x\right)+3\)

   = \(x^3.\left(x+y-2\right)+x^2y.\left(x+y-2\right)-x.\left(x+y-2\right)+3\)

   =\(x^3.0+x^2y.0-x.0+3=3\)

=> P = 3

đúng cái nhé