长方体;(4*2+4*5+2*5)*2=76;正方体;8*8*6=512;圆柱;12*3.14*10=376.82. 4*3.14*1.5+2*2*3.14=31.4 3. 25.12/10/3.14=0.8 4. (0.3*3.14+0.02)*3.2=3.034
长方体;(4*2+4*5+2*5)*2=76;正方体;8*8*6=512;圆柱;12*3.14*10=376.82. 4*3.14*1.5+2*2*3.14=31.4 3. 25.12/10/3.14=0.8 4. (0.3*3.14+0.02)*3.2=3.034