a) Ta có:

x-y=0 (1)

\(M=7x-7y+4ax-4ay\)

\(M=7\cdot\left(x-y\right)+4a\cdot\left(x-y\right)\) (2)

Thay (1) vào (2), ta được

\(M=7\cdot0+4a\cdot0\)

\(M=0+0\)

\(M=0\)

Vậy M=0

\(Ta có: x-y=0 => x=y \)

\(Khi đó, ta có: \)

\(a) M=7x-7y+4ax-4ay-5 =(7x-7x) +(4ax-4ax)-5 \)

\(M=0+0-5=-5 \)

\(Vậy M=-5\)

\(b) N=x(x^2+y^2)-y(x^2+y^2)+3\)

\(=> N=[x(x^2+x^2)-x(x^2+x^2)]+3\)

\(=> N=0+3=3\)

\(Vậy N=3\)

a, M = 7x - 7y + 4 ax - 4ay - 5

= 7 ( x - y ) + 4a ( x - y ) - 5

= 0 + 0  - 5

= -5

b, N = x ( x² + y² ) - y ( x² + y² ) + 3

= ( x - y ) ( x² + y² ) + 3

=0 + 3

=3

a, M= 7(x-y)+4a(x-y)-5 = 7.0+4a.0-5=-5

b, N=(x² +y² ).(x-y) +3=(x² +y² ).0+3=3

M=7x - 7y + 4ax - 4ay - 5

=7 ( x - y ) + 4a ( x - y ) - 5

=0 + 0 - 5 = -5

a) M=7x-7y + 4ax - 4ay - 5

      =7(x-y) + 4a(x-y) - 5= 7.0 + 4a.0 - 5= -5

b)N=x(x^2 + y^2) - y(x^2 + y^2)+3

     =x^3 + xy^2 - x^2y - y^3 + 3

     =x^3 - x^2y + xy^2 - y^3 +3

     =x^2(x-y) + y^2(x-y) + 3= x^2.0 + y^2.0 + 3= 3

Bài làm

M = 7x - 7y + 4ax - 4ay - 5

M = 7.( x - y ) + 4x ( x - y ) - 5

M = 7 . 0 + 4x . 0 - 5

M = -5

Vậy giá trị của M = -5

# Chúc bạn học tốt #

làm mà tự trả lời là sao 

ngáo à 

Ta có : \(C=x^3+y^3-x^2y-xy^2+7x^2-7y^2+2016\)

\(=\left(x^3-x^2y+7x^2\right)-\left(xy^2-y^3+7y^3\right)+2016\)

\(=x^2\left(x-y+7\right)-y^2\left(x-y+7\right)+2016\)

\(=x^2\cdot0-y^2\cdot0+2016=2016\)

( Do \(x-y+7=0\))

Vậy : \(C=2016\)

\(C=\left(x^3-x^2y+7x^2\right)-\left(xy^2-y^3+7y^2\right)+2016=x^2\left(x-y+7\right)-y^2\left(x-y+7\right)+2016=0+0+2016=2016\)

Vậy C=2016

a, \(M=7.\left(x-y\right)+4a.\left(x-y\right)-5\)

Theo bài ra ta có: x-y=0

=> \(M=0+0-5\)

\(\Rightarrow M=-5\)

b,

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

\(\Rightarrow N=0+3=3\)

lớp 7 lên 8 à làm quen nhá :)

a) \(M=7x-7y+4ax-4ay-5\)

\(M=7\left(x-y\right)+4a\left(x-y\right)-5\)

\(M=0+0-5=-5\)

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

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

\(N=0+3=3\)

  Ta có   \(x-y=0\) 

a)    M = 7x - 7y +4ax - 4ay - 5

           = 7( x - y )+ 4a( x - y ) - 5

           = 7.0 + 4a . 0 - 5

           = -5

b)  N = x( x²+y² ) - y( x² + y² ) + 3

         =  ( x - y ).( x² + y² ) +3

         = 0. ( x² + y² ) + 3

         = 3

a: \(=3x^4+3x^2y^2+2x^2y^2+2y^4+y^2\)

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

\(=3x^2+3y^2=3\)

b: \(=7\left(x-y\right)+4a\left(x-y\right)-5=-5\)

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

d: \(=\left(x+y\right)^2-4\left(x+y\right)+1\)

=9-12+1

=-2