July 2022 1 3 Report
Выполните сложение: а) ( 3 а²- 2 а)+ ( -а²+ 3 а), б) ( 6 с² - 2 сd) + ( 10 c²+ 18 cd), в) ( 14 mn - 15 m) + ( - 15 mn - 14 m) , г) ( 3а² - 7b²) + ( 6b² - 2а²).
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