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b) 4a+3a+a=7a+a=8a
c) 2a+3b+5a-2b = (2a+5a)-2b+3 = 7a-2b+3
d) 5+2xy-3-xy=(2xy-xy) + (5-3)= 2xy+xy
Myślę że pomogłem liczę na NAJ!!!!!