How to do the sixth page of the third grade math classroom exercise book published by People's Education Press?
3. 14×8×50 3. 14×(8÷2)? ×2 1256+ 100.48 = 1356.48(cm？ )
=25. 12×50 =3. 14×4? ×2
= 1256(cm？ ) =3. 14× 16×2 A: The surface area of the cylinder to be machined is 1356.48cm? .
= 100.48(cm？ )
I typed it word by word,