xep mot khoi lap phuong nho canh 1cm thanh mot khoi dang hinh hop chu nhat lon co chieu dai 6cm ; chieu rong 4cm va chieu cao 3cm.
a)Tinh the tich hinh hop chu nhat xep duoc.
b)Tinh so khoi lap phuong nho dung de xep
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
nguoi ta do trong long 1 chiec hop dang hinh hop chu nhat co chieu dai 6cm chieu rong 4cm chieu cao 5cm hoi co the xep duoc bao nhieu hinh lap phuong 1dm khoi de day chiec hop do
1 hinh hop chu nhat co chieu dai la 14 cm , chieu rong la10, chieu cao la 10, nguoi ta xep bang cac hinh lap phuong nho canh 1 cm . sau do son 4 mat xung quanh . hoi co bao nhieu khoi lap phuong nho son 1 mat , son 2 mat/
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 ?
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 ?
thung bia cung danh hinh hop chu nhat co chieu dai 8cn,chieu rong 5cm,chieu cao 6cm.Nguoi ta dat mot khoi go hinh lap phuong vao trong hop do.Ti le the tich giua hinh lap phuong va hinh hop chu nhat la 1:10.Tinh:
a/ The tich thung bia hinh hop chu nhat
b/ The tich khoi go lap phuong
giup minh nha minh can loi giai gap.
xep 2160 hinh lap phuong canh 1 cm thanh hinh hop chu nhat co chieu dai 18 cm chieu rong 12cm .Tinh chieu cao cua hinh hop chu nhat xep duoc do
Mot cai hop co dang hinh hop chu nhat co chieu dai 36 cm chieu rong 24 cm va chieu cao 12 cm . Nguoi ta xep cac hinh lap phuong nhu nhau canh 3 cm vao day hop do . Hoi can bao nhieu hinh lap phuong nhu the