Jawabanmu

2014-09-05T20:31:34+07:00
1. a(b + c)
2. πr(r + s)
5. (x+y) (x-y)
6. (2x + 7) (2x - 7)

2014-09-05T20:59:53+07:00
3. x(x-4)
4. 2(3x pangkat2-5x)
7. (x+1) (x+2)