. Usuń nawiasy i zredukuj wyrazy podobne :
a) 5x + ( 2x - 7 ) - 9x - ( - 3x + 8 ) + 20 - 8x
b) -5x + ( - 2y + 4x ) - ( 7x - 8y ) - x + ( 2 - 6y )
c) -9z - ( 4 - 3z ) - 8y - ( - 7z + 8y ) + ( - 2y - 7 )
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a) 5x + ( 2x - 7 ) - 9x - ( - 3x + 8 ) + 20 - 8x = 5x+2x-7-9x+3x-8+20-8x = -7x+5
b) -5x + ( - 2y + 4x ) - ( 7x - 8y ) - x + ( 2 - 6y ) = -5x-2y+4x-7x+8y-x+2-6y = -9x+2
c) -9z - ( 4 - 3z ) - 8y - ( - 7z + 8y ) + ( - 2y - 7 ) = -9z-4+3z-8y+7z-8y-2y-7 = z-18y-11
a) 5x + ( 2x - 7 ) - 9x - ( - 3x + 8 ) + 20 - 8x =
=5x +2x -7 -9x +3x -8 +20 -8x =
=-7x+5
b) -5x + ( - 2y + 4x ) - ( 7x - 8y ) - x + ( 2 - 6y )=
= -5x -2y +4x -7x +8y -x +2 -6y=
=-9x+2
c) -9z - ( 4 - 3z ) - 8y - ( - 7z + 8y ) + ( - 2y - 7 )=
= -9z -4 + 3z - 8y + 7z -8y -2y -7=
=z -18y -11