USUŃ NAWIASY I ZREDAGUJ 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) =
d) ( 2a + 4 ) - (3a - 5) =
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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-11-18y
d)
( 2a + 4 ) - (3a - 5) =2a+4-3a+5=-a+9
a) 5x +(2x-7) -9x -(-3x +8) +20 - 8x =
5x + 2x - 7 -9x +3x -8 +20 -8x = 10x - 17x --15 + 20 = -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 -11 -18y
d) ( 2a +4) -( 3a -5) =
2a + 4 -3a +5 = -a +9