7. Упростите выражение. 21. 21m + 19m 22. -13n - 3,2n 23. -62x2 + 15x2 24. 16y2 - 48y2 25. 27x2y -0,9x2y 26.-5a2*(-21a2) 27. 1,2b*6b2 28. 63ab*(-2а) 29, 21b*ас 30. -Зmn2*17mn Помогите пожалуйста​
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