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)
mot nen nha hinh chu nhat co tong do dai hai canh lien tiep la 11m chieu rong kem chieu dai 3m
a) tinh dien tich nen nha
b) nguoi ta lat nha bang gach n]men hinh vuong canh 40 cm hoi phai dung bao nhieu vien gach de lat kin nen nha ( coi manh vua la ko dang ke )
De lat nen mot can phong , nguoi ta su dung het 200 vien gach hinh vuong co canh 30cm . Hoi can phong do co dien tich bao nhieu met vuong , biet dien tich phan mach vua khong dang ke ? NHO TOM TAT VA GIAI NHA
de lac nen mot phong hoc hinh chu nhat , nguoi ta dung loai gach men hinh vuong co canh 20cm . hoi can bao nhieu vien gach de lac kin nen phong hoc co chieu rong 5m , chieu dai 8m va phan mach vua khong dang ke?
mot san choi hinh chu nhat co chieu rong 36m va chieu dai gap 5 lan chieu rong. Nguoi ta dung loai gach cu moi met vuong can 4 vien gach de lat san choi do. Hoi can it nhat bao nhieu chuyen xe de cho du gach lat san choi tren? Biet rang moi chuyen xe cho 350 vien gach va coi dien tich cac mach vua 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)
de lat nen mot phong hoc hinh chu nhat,nguoi ta da dung loai gach men hinh vuong co cach 20cm.hoi can bao nhieu vien gach de lat kin phong hoc do,biet rang nen phong hoc co chieu rong 5m,chieu dai 8m va phan gach vua khong dang ke ?
de lat mot phong hoc nguoi ta phai dung het 400 vien gach lat nen hinh vuong co canh 5dm.hoi dien tich phong hoc do rong bao nhieu met vuong ?[biet dien tich phan mach vua khong dang ke]
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 .