1khoi hop chu nhat co kich thuoc 50*40*30 duoc xep boi cac khoi lap phuong canh 1 dm nguoi ta son cac mat ngoai cua khoi hop do  hoi co bao nhieu hinh lap phuong nho khong duoc son 

Nguoi ta xep cac khoi nhua hinh lap phuong canh 1 cm thanh hinh hop chu nhat ( nhu hinh ve ) . Tinh the tich va dien tich toan phan cua hinh hop chu nhat do

Nguoi ta xep 960 khoi lap phuong nho canh 1 cm thanh mot khoi hop chu nhat dai 12 cm; rong 10 cm.Sau do nguoi ta dem son 6 mat ngoai cua khoi hop vua xep duoc.Hoi co bao nhieu khoi hinh lap phuong nho khong son mat nao ?

Nguoi ta xep 960 khoi hinh lap phuong nho canh 1 cm thanh mot khoi hop chu nhat dai 12 cm; rong 10 cm.Sau do nguoi ta dem son 6 mat ngoai cua khoi hop vua xep duoc.Hoi co bao nhieu khoi hinh lap phuong nho duoc son 1 mat ?

xếp 6 khoi lap phuong nhua hinh lap phuong canh 3 cm thanh mot hinh hop chu nhat co chieu cao 6cm .Tinh s xung quanh cua hinh hop chu nhat xep duoc do 

mot khoi go hinh hop chu nhat co chieu dai 14 cm , chieu rong 10 cm , chieu cao 6 cm duoc son 6 mat . nguoi ta cua khuc go thanh 105 khoi lap phuong co canh 2 cm . Vay co :

a) ......khoi lap phuong duoc son 3 mat

b ) ....... khoi lap phuong duoc son 2 mat

c)......khoi lap phuong duoc son 1 mat

d)......khoi lap phuong khong duoc son mat nao ?

Nguoi ta xep 960 khoi lap phuong nho canh 1cm thanh 1 khoi hop chu nhat dai 12cm rong 10cm .Sau do nguoi ta dem son 6 mat ngoai khoi hop vua xep duoc . Hoi co bao nhieu khoi lap phuong nho duoc son 2 mat

nguoi ta xep 1331 hinh lap phuong nho canh 1 cm thanh 1 khhoi lap phuong lon.sau do nguoi ta son 4 mat xung quanh va day tren cua khoi lap phuong sep duoc.hoi co bao nhieu hinh lap phuong nho khong duoc son khong son mat nao

Ban An dem xep nhung khoi hinh lap phuong nho canh 1cm thanh mot khoi lap phuong lon co the tich la 512 cm3. Sau do An lay ra 4 khoi lap phuong nho o 4 dinh phia tren cua khoi lap phuong lon vua xep duoc. Em hay tinh dien tich toan phan cua khoi con lai