1. a(2+b)+b+2
2a+ab+b+2
2. a(b-c)-(c-b)
ab-ac-(c-b)
ab-ac-c+b
3. 419*519-4192=217461-4193=213269
4. 5x-5y-ax+ay
5(x-y)-a(x-y)
1. a(2+b)+b+2
2a+ab+b+2
2. a(b-c)-(c-b)
ab-ac-(c-b)
ab-ac-c+b
3. 419*519-4192=217461-4193=213269
4. 5x-5y-ax+ay
5(x-y)-a(x-y)