1)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)" Life is not a problem to be solved but a reality to be experienced! "
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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 = – 17x+2
C)-9z-(4-3z)-8y-(-7z+8y)+(-2y-7) = -9z-4+3z-8y+7x-8y-2y-7 = -6z – 11-18y+7x
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