gasiti greselile
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① 43·5 + 43·4 = 43·(5 + 4) = 43·9=387
② 28·7 + 28·12 - 19·28 = 28·(7 + 12 - 19) = 0
③ 121·9 - 121 + 121·2 = 121·(9 - 1 +2) = 121·10 = 1210