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=7a+3a-5
=10a-5
b. a²-4ab + -5a²+3ab
=a²-5a²-4ab+3ab
=-4a²-ab
semoga membantu
= ( 7a + 8 ) + ( 3a - 5 )
= 7a + 8 + 3a - 5
= 7a + 3a + 8 - 5
= 10 a + 3
b.) a² - 4 ab dan - 5a² + 3 ab =
= ( a² - 4 ab ) + ( - 5a² + 3 ab )
= a² - 4 ab - 5 a² + 3 ab
= a² - 5 a² - 4 ab + 3 ab
= - 4a² - ab
semoga membantu ^_^
maaf kalau salah.. :)