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871+141-351=; 251+481-261=; 461+541-451=; vreau probă

Răspuns :

871+141=1012;1012-351=661;proba:661+351=1012
251+481=732;732-261=471proba:471+261=732
461+541=1002;1002-451=551;proba551+451=1002