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99 - 18y - 66 + 12y
99 - 66 - 18y + 12y
33 - 6y
2. 3 [b + 5 (b - a)]
3 [b² - ab + 5b - 5a]
3b² - 3ab + 15b - 15 a
jangan lupa tandai sebagai jawaban terbaik + bintangnya
dan lebih giat belajar