Odpowiedź:
a) -2x+2x+2-10=3-10
b) -ab-2ab+2=3-3ab
c) -st-s-st+tw-=-s-2st+tw-
d) -mn+30m-30n
e) ca+bc-2-2bc-2ab=ca-2-bc-2ab
f) x-xy-y+xy=x-y
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Odpowiedź:
a) -2x+2x+2-10=3-10
b) -ab-2ab+2=3-3ab
c) -st-s-st+tw-=-s-2st+tw-
d) -mn+30m-30n
e) ca+bc-2-2bc-2ab=ca-2-bc-2ab
f) x-xy-y+xy=x-y