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7. (2x-5)(3x-2) = ax²+bx+c
6x²-19x+10 = ax²+bx+c
maka a+b+c = 6 - 19 + 10 = -3 (C)
8. FPB dari 6a³b dan 3a²b² adalah 3a²b (B)
semoga membantu:)