Jawabanmu

2014-08-31T19:27:29+07:00
1. x2-4x-1-2x2-4x
x2-2x2-4x-4x-1
x2-1

2. y2-3-4y-5y-6
y2-4y-5y-3-6
y2-y-3

3. 5a+6+ab-a-2ab+1
5a-a+ab-2ab+6+1
4a+ab+7