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3+9 .-2+3
12.1
12
masa ukuran minus?
=-2m.3m + (-2m).9 + 3.3m +3.9
= -6m" + (-18m) + 9m + 27
= -6m" -9m +27
= 6m" + 9m - 27
= 2m" + 3m -9