упростите выражения .1) 5mn-7mn+3m-m 2) mn-3mnk+4mn 3) 2ab-ab+5ab 4) 7ab-5bc-2ab.
1)-2mn+2m2)5mn-3mnk3)6ab4)5ab-5bc
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1)-2mn+2m
2)5mn-3mnk
3)6ab
4)5ab-5bc