Cho tam giác ABC trọng tâm G CMR: vecto MG = 1/3( vecto MA + vecto MB + vecto MC) với M bất kì

giúp mình với ạ a. Industrial activities / greatly / destroy / environment / in recent years. b. Online shopping / both / beneficial / harmful / environment. c. This trend / can / reduce / number / private vehicle. d. One / main cause / air pollution / exhaust fumes / from / private vehicle. e. Growth / e-commerce / bring / both / negative / positive / impact / employment. f. Live / cities / give / people / more job opportunities / better / education. g. Government / should / responsible / protect / environment. h. Individuals / can / greatly / contribute / environmental protection / by / work / together. i. Compared to / countryside / cost of living / cities / much / higher. j. Tackle / problem / of / unemployment / still / question / for / government.