October 2018 2 39 Report
15. Hasil pengurangan (a^2-ab-b^2) dari (b^2+ab-3a^2 )adalah . . . .
A. -4a^2
B. 4a^2+2ab
C. 2b^2+2ab-4a^2
D.2b^2-2ab+4a^2

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