Skróć:
a) -(2+x-5)
b) -(-2-x+5)
c) -(2-x+5)
d) -3(x-y)+(x+3y)
e) -2(x+2y)
f) (x+y)-3(x-y)
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a) -(2 +x -5) = -2 -x +5 = -x +3
b) -(-2 -x +5) = 2 +x -5 = x -3
c) -(2 -x +5) = -2 +x -5 = x - 7
d) -3(x-y) +(x +3y) = -3x +3y +x +3y = -2x +6y
e) -2(x +2y) = -2x -4y
f) (x +y) -3(x -y)= x +y -3x +3y = -2x +4y