2.(a+b)？ +2(a+b)+ 1=(a+b)？ +2(a+b)+ 1？ (collocation method) =[(a+b)+ 1]? =(a+b+ 1)？

The fourth power of 3.4x-the third power of 4x+x? =x？ (4x？ -4x+ 1) (re-matching method) =x? (2x- 1)？

4.x？ - 16ax+64a？ (or matching method) =(x-8a)?

5.(x- 1)(x-3)+ 1 (left parenthesis) =x? -4x+3= 1=x？ -4x+4 (how to always match methods) =(x-2)?

6.(ab+a)+(b+ 1) (open bracket) =a+b+ab+ 1 (using double cross multiplication) =(a+ 1)(b+ 1).