1) Reduz os termos semelhantes:
a) ( + 5x -4x + 6x - 7x + 2x ) + ( - 8x + 2x - 3x + 5x - 7x + 3x )=
b) ( - 8x + 3x -5x + 2x - 9x + x ) + (+ 11x + 7x -2x + 3x - 9x + 4x )=
c) ( - 12y + 6y -3y + 6y - 8y + 5y ) + ( - 2y - 12y + 15y -9y + 10y - 8y + 12y )=
d) (- 3m - 10m+ 15m -2m + 8m - 7m + 11m ) + ( - m - 3m - 11m + 13m -2m + 7m - 10m + 9m )=
e) ( -7xy + xy + 5xy -9xy + 8xy - 4xy - xy ) + (+ 14xy -9xy + 3xy + 8xy -10xy + 4xy -4xy )=
f) ( + 8xy -4xy + 3xy + 7xy -12xy + 6xy -4xy -7 xy ) – ( - 5xy -7xy + xy + 5 xy - 8xy + 5xy )=
g) (-7mn + mn + 5 mn -9mn + 8mn -4mn - mn ) – ( + 2mn + 5 mn -6 mn + 5mn -7mn - 9mn -8mn )=
h) ( - 5ab +3ab + 5ab -9ab + 8ab -4ab ) – ( + 5ab + 5ab -8ab + 9ab -3ab - 10ab)=
i) ( + 7z -4z +13z -15z -14z + 11z ) – ( + 8z -14z +9z -10 z -14z + 10z + 14z)=
j) ( + 7mn - 4mn +12nm - 7mn - 14mn + 12nm ) – ( +5mn + mn –6nm + 9mn - 5nm - 12mn)=
Soluções para a tarefa
A -
( + 5x - 4x + 6x - 7x + 2x ) + ( - 8x + 2x - 3x + 5x - 7x + 3x ) =
+ 2x + (-8x)
2x - 8x
= -6x
B -
( - 8x + 3x -5x + 2x - 9x + x ) + (+ 11x + 7x -2x + 3x - 9x + 4x ) =
- 16x + (+14x)
- 16x + 14x
= -2x
C -
( - 12y + 6y -3y + 6y - 8y + 5y ) + ( - 2y - 12y + 15y -9y + 10y - 8y + 12y ) =
- 6y + (+6y)
x = 0
D -
(- 3m - 10m+ 15m -2m + 8m - 7m + 11m ) + ( - m - 3m - 11m + 13m -2m + 7m - 10m + 9m ) =
12m + (-7m)
= 5m
E -
( -7xy + xy + 5xy -9xy + 8xy - 4xy - xy ) + (+ 14xy -9xy + 3xy + 8xy -10xy + 4xy -4xy ) =
-7xy + (+6xy)
= -1xy
F -
( + 8xy -4xy + 3xy + 7xy -12xy + 6xy -4xy -7 xy ) – ( - 5xy -7xy + xy + 5 xy - 8xy + 5xy ) =
- 3xy - (-9xy)
-3x + 9xy
= 6xy
G -
(-7mn + mn + 5 mn -9mn + 8mn -4mn - mn ) – ( + 2mn + 5 mn -6 mn + 5mn -7mn - 9mn -8mn ) =
- 7mn - (-18mn)
- 7mn + 18mn
= 11 mn
H -
( - 5ab +3ab + 5ab -9ab + 8ab -4ab ) – ( + 5ab + 5ab -8ab + 9ab -3ab - 10ab) =
9ab - (-2ab)
9ab + 2ab
= 11 ab
I -
( + 7z -4z +13z -15z -14z + 11z ) – ( + 8z -14z +9z -10 z -14z + 10z + 14z) =
- 2z - (+3z)
- 2z - 3z
= -5z
J -
( + 7mn - 4mn +12nm - 7mn - 14mn + 12nm ) – ( +5mn + mn –6nm + 9mn - 5nm - 12mn) =
6 mn - (-8mn)
6 mn + 8mn
= 14mn
Resposta:
A) 2x + 8x = 10x
B) 16x + 14x = 30x
C) -7y + (-4y) = -7y - 4y = -11y
D) +12m +30m = 42m
E) -7xy +6xy = -xy
F) -3xy - (-9xy) = -3xy + 9xy = +6xy
G) -7mn - (18mn) = -7mn + 18mn = +11mn
H) -2ab - (-2ab) = -2ab +2ab = 0
I) -2z - (+3z) = -2z -3z = 5z
J) -6mn - (-8mn) = -6mn +8mn = +2mn