The fifth grade mathematics first volume Huanggang small champion painting problem and the fifth problem.
Drawings: the first sheet: upper bottom 2, lower bottom 3, height 10, the second sheet: upper bottom 5, lower bottom 20, height 2, and the third sheet: upper bottom 1. Bottom 4 Height 10 Question 5:156-(12× 8 ÷ 2) =108 (square centimeter)