Упростите выражение:
1)2ab=ab 2) 3ab+7ab 3)7mn-3mn 4)8mn-5mn
5)3ab+8ab-10ab 6)2ab-17ab+20ab 7)xy-12xy-13xy
1)2ab=ab 2) 3ab+7ab 3)7mn-3mn 4)8mn-5mn
5)3ab+8ab-10ab 6)2ab-17ab+20ab 7)xy-12xy-13xy
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2)10ab
3)4mn
4)3mn
5)1ab
6)5ab
7)-14xy