2. (1) 12*5* 3 =20 cubic centimeters (2)3. 14*4 square * 15=753.6 square centimeters 753.6 * 3 = 251.

3. 12.56 divided by 3. 14 divided by 2 = 2m3.14 * 2m2 *1.5 =18.84m2 18.84* one third = 6.

4.3. 14*( 10 divided by 2) Square * 10* Three-thirds = 785 cubic centimeters.

5. (two-thirds) ideas; Try again and again, and all the corners are filled with water.