6*6*6=2 16 (cubic centimeter)

2*2*2=8 (cubic centimeter)

2 16/8=27 (piece)

You can get 27 small cubes.

Surface area increase: 6*6*2*6=432 (square centimeter)

16、

Surface area:

① Semi-cylinder: 3.14 *10 = 314 square (square centimeter)

3. 14*20*20= 1256 (square centimeter)

1256/2=628 (square centimeter)

3 14+628=942 (square centimeter)

② Cube: 20*20*5=2000 (square centimeter)

③2000+942=2942 (square centimeter)

Volume:

① Semi-cylinder: 3. 14* 10 *20=6280 (cubic centimeter) 6280/2=3 140 (cubic centimeter) square.

② Cube: 20*20*20=8000 (cubic centimeter)

③ 3140+8000 =11140 (cubic centimeter)

17、

Volume:

5*5*5= 125 (cubic centimeter)

125 *10 =1250 (cubic centimeter)

Surface area:

5*5*6* 10= 1500 (square centimeter)

5*5*26=650 (square centimeter)

1500-650=850 (square centimeter)

The answers to these questions are all told by our math teacher.

For the sake of playing so hard, choose me!