Question

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

Answer 1

A ) 5x + (2x - 7 ) - 9x -(-3x +8) + 20 - 8x=5x+2x-7-9x+3-8+20-8x=-8x+8
b) - 5x + (- 2y +4x ) - (6x - 8y )- x +(2 - 6y)=-5x-2y+4x-6x+8y-x+2-6y=
-8x+2
c) - 9z - (4 -3z ) -8y -)-7z+8y)+(-2y -7) =-9z-4+3z-8y+7z-8y-2-7=z+10x-8y-21