February 2019 0 52 Report
Wskaż wszystkie wyrażenia równe sumie zapisanej na zielonym polu 5a+4ab-7b. 9ab-7b. 5a-(-4a)b-7b. 5a-4ab+7b. 5a+2ab+(-7)b. 5a+2a2b-7b.
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