Question

-2xy-(-y+6x)-3xy=

dla

x=-1

y=-5

..................................................................

- ( - x do kwadratu ) - ( - 2 xy ) - ( - x do kwadratu ) + ( - xy ) - 3x =

dla :

x = -1

y = 2

.....................................................................

- 7 - ( -2x ) + ( - 4 xy ) - ( - 3x ) - ( - 7 -6 x )+ ( -x + 4 )=

.......................................................................

- 3 ay - 4y + 4ay + y =

.......................................................................

Answer 1

Rozwiązanie:

a)

-2xy-(-y+6x)-3xy= -5xy +y -6x = - 5(-1)(-5) - 5 - 6 (-1)= -25 -5 +6 = -24

 

b)

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

 = 2x^2 + xy -3x = 2 (-1)^2 + (-1)*2 - 3 (-1)= 2-2 +3 = 3

 

c)

- 7 - ( -2x ) + ( - 4 xy ) - ( - 3x ) - ( - 7 -6 x )+ ( -x + 4 )= -7 +2x -4xy +3x +7 +6x -x +4 = 12x -4xy +4

 

d)

 

 - 3 ay - 4y + 4ay + y = ay -3y

Answer 2

-2(-1*(-5))-(-1-6*1)-3(-1*(-5))=-10-7-15=-32

 

-(-x2)-(-2xy)-(-x2)+(-xy)-3x=1-4+1-2+3=-1

 

-7-(-2x)+(-4xy)-(-3x)-(-7-6x)+(-x+4)=-7+2x-4xy+3x+7+6x-x+4=18+10x-4xy

 

-2ay-4y+4ay+y=2ay-3y