Jawabanmu

Jawaban paling cerdas!
2014-08-13T21:42:25+07:00
1. A + B = 3xy - 12x + 2x + xy = 4xy - 10x
2. A - 2B = (3xy - 12x) - 2(2x + xy) = (3xy - 12x) - (4x + 2xy) = xy - 16x
3. 3A + 4B = 3(3xy - 12x) + 4(2x + xy) = 9xy - 36x + 8x + 4xy = 13xy - 28x