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no2. -3a(pangkat2)+5ab-11
kalau tidak salah
9m - 7mn + 4mn + ( -12m )
2m - 8mn
atau 2m + ( -8mn )
2. 2a² + 3ab - 7 - 5a² + 2ab - 4
2a² - 5a² + 3ab + 2ab - 7 - 4
-3a² + 5ab - 11
atau -3a² + 5ab + ( -11 )
ma'af kalau ada yang salah!!!