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Qingdao edition mathematics textbook, the second volume of grade five, 92 pages, how to make a smart hut?
1.( 1) 1× 1×6×2 = 12cm? (2) 1× 1× 10 = 10cm? 12- 10=2cm?

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?