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b) mn+mn+mn=3mn
c) z/4= z × 1/4
d) x^2 + x^2= 2x^2
e) 8-x /2 = (8-x) ×1/2
f) y^3 /3 = y^3 × 1/3
mn+mn+mn= 3mn
a reszty nie wiem :) :)