Mot dam ruong hinh thang vuong day lon dai 120m,day be ngan hon day lon 40m,chieu cao bang 3/4 tong do dai hai day.

a.Tim dien tich dam ruong do.

b.Nguoi ta ngan dam ruong hinh thang ra mot hinh tam giac sao cho phan ruong con lai la mot hinh chu nhat.Tim dien tich phan tam giac duoc ngan ra.

c.nguoi ta trong hai thu lua khac nhau tren hai phan ruong nay,tong so lua thu hoach duoc la 3210kg.Lua thu duoc tren phan ruong tam giac chi bang 3/10 so lua thu duoc tren phan ruong hinh chu nhat.Hoi moi dam vuong ruong nao thu duoc nhieu lua hon va hon bao nhieu kg lua ?

1/Mot vuon hoa hinh hop chu nhat  co chu vi la 128m,chieu rong bang 3phan5 chieu dai .Tinh dien tich hinh chu nhat .

2/Mot manh vuon hinh chu nhat co chu vi 228m, chieu rong 40m .o giua manh vuon , nguoi ta dao 1 cai ao hinh vuong canh 10m .Tinh dien tich phan dat con lai .

3/Mot thua ruong hinh thang co day lon la 69m,day be 2phan3 day lon va chieu cao bang 3 phan 4 tong do dai hai day.

a/Tinh dien tich thua ruong do

b/Trung binh 100m vuong thua ruong thu hoach duoc 70 kg thoc. Hoi ca thua ruong thu hoach duoc bao nhieu ki lo gam thoc .

4/Mot hinh hop chu nhat co chieu cao bang trung binh cong cua dai va rong .Dien tich xung quanh cua hinh hop la 2500m vuong .Chieu dai hon chieu rong 20 cm .Tinh the tich hinh hop .

Bai 1 :Mot thua ruong hinh thangco trung binh cong hai day la 301,5 m . Neu tang day lon them 5,6 m thi dien tich thua ruong tang them 336 m2 

a}tinh dien tich thua ruong hinh thang bang don vi dam2

b}Cu 300 m2 thu duoc 22,5 tan thoc . Tinh xem tren ca thua ruong thu hoach duoc bao nhieu kilogam thoc ?

Bai 2 : Mot hinh thang co dien tich 3780 m2 va chieu cao 45 m . Day be bang 3/5 day lon . Tinh moi day cua hinh thang ?

Bai 3:Mot khu ruong hinh thang co chieu cao 50 m . Day lon 145 m ; day be 95 m . Moi met vuong thu hoach duoc 1,74 kg thoc . Hoi nguoi ta thu hoach duoc bao nhieu tan thoc tren thua ruong ay ?

Bai 4: Mot hinh thang co chieu cao 34 dm . Day lon gap doi day be . Dien tich hinh thang bang dien tich 1 hinh chu nhat chieu dai 68 dm ; chieu rong 30 dm . Tinh do daii moi day hinh thang ?

Bai 5 : Mot hinh thang co day lon 60 cm ; day be 38 cm . Neu keo dai day lon them 20 cm va day be 12 cm ve cung mot phia thi dien tich se tang them 512 cm2 . Tinh dien tich hinh thang luc dau ?

Bai 6:Mot hinh thang vuong co dien tich 85 dm2 va hieu 2 day la 3 dm . Neu keo dai day lon them 4 dm nua thi dien tich tang them 20 dm2 . Tinh do dai moi day cua hinh thang vuong do ?

giai han ra nha minh cho moi bai 100 mk nha tong cong se la 600 mk do nha ! ai giai xong ket ban luon voi minh nha ! thanks!