bai 7 : 1 nen nha hinh chu nhat co tong do dai hai canh lien tiep la 11 m, chieu rong kem chieu dai 3 m . Hoi
a)tinh dien tich nen nha
b) nguoi ta lat bang gach men hinh vuong canh la 40 cm. Hoi phai dung bao nhieu vien gach de lat kin nen nha ( coi mach vua la khong dang ke)
De lat nen mot lop hoc hinh chu nhat nguoi ta dung cac vien gach bong hinh vuong co canh dai 20 cm. Biet chu vi nen la 36m , chieu dai hon chieu rong 4 m . Tinh so gach bong can dung de lat nen (coi dien tich mach vua la khong dang ke)
Mot nen nha hinh chu nhat co chu vi la 60m, chieu rong bang 2/3 chieu dai, nguoi ta lat nen bang nhung vien gach hinh vuong canh 2dm.hoi can bao nhieu gach de lat kin nen nha do
Mot nen nha hinh chu nhat co chieu dai 15 m , chieu rong 6 m .
a, Tinh dien tich nen nha do ?
b, Tinh so vien gach hoa hinh vuong can dung de lat nen nha do , biet rang canh cua moi vien gach la 30 cm va gach vua khong dang ke ?
Nguoi ta lat gach hoa hinh vuong co canh 30cm tren mot nen nha co chieu dai 45m va chieu rong 5m. Hoi nguoi ta phai lat tren nen nha do tat ca bao nhieu vien gach? (Mach vua khong dang ke)
1 nen nha hinh chu nhat co chieu dai 9m chieu rong 6m hoi can bao nhieu vien gach men hinh vuong canh 30cm de lat kin nen nha do
Mot phong hoc hinh chu nhat co tong do dai hai canh lien tiep lef 15m. Chieu dai hon chieu rong la 3m. Tinh dien tich can phong?De lat het can phong do nguoi ta phai dung het bao nhieu vien gach vuong co canh 30cm
mot nen phong hoc hinh chu nhat co chieu dai 12m ,chieu dong 9m .nguoi ta muon lat nen phong hoc do thi can it nhat bao nhieu vien gach men hinh vuong c0 canh 3 dm .biet dien tich phan mach vua la khong dang ke .