2.( 1) 1× 1× 14 = 14cm？ 3×6- 14=4cm？

(2) 1× 1× 18 = 18cm？ 4×6- 18=6cm？

3. From the above, the rule is: every time you spell one more, the area decreases by 2cm? .

1× 1×6×20 = 120cm？ 1× 1×6-38=82cm？