Odpowiedź:
a) (a+b) - (2a-6) - (a-2b) = a+b-2a+6-a+2b = -2a+3b+6
b) (3x-y-1) - (x+y) + (y-x) = 3x-y-1 -x-y+y-x = x -y -1
c) 2(x+1) - 3 (x-1) = 2x+2-3x+3 = -x +5
d) 2x(x-1)-3(x²-4x+7) = 2x²-2x-3x²+12x-21 = -x²+10x-21
e) -(2a-3b+5) + (4a-7b+3) - (-3a-2b-1) = -2a+3b-5+4a-7b+3+3a+2b+1 = 5a-2b-1
Szczegółowe wyjaśnienie:
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Odpowiedź:
a) (a+b) - (2a-6) - (a-2b) = a+b-2a+6-a+2b = -2a+3b+6
b) (3x-y-1) - (x+y) + (y-x) = 3x-y-1 -x-y+y-x = x -y -1
c) 2(x+1) - 3 (x-1) = 2x+2-3x+3 = -x +5
d) 2x(x-1)-3(x²-4x+7) = 2x²-2x-3x²+12x-21 = -x²+10x-21
e) -(2a-3b+5) + (4a-7b+3) - (-3a-2b-1) = -2a+3b-5+4a-7b+3+3a+2b+1 = 5a-2b-1
Szczegółowe wyjaśnienie: