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!
Mot hinh thang co day lon 24 cm , day nho bang 2 / 3 day lon . Neu keo dai day lon them 5 cm thi dien tich hinh thang tang len 30 cm vuong . Tnh dien tich hinh thang ban dau
1 hinh thang co day lon 24cm,day nho bang 2/3day lon.Neu keo dai day lon them 5cm thi dien tich hinh thang tang len 30 cm2. Tinh dien tich hinh thang luc dau
Đáy bé hình thang là :
24 x 2/3 = 16 ( cm )
Chiều cao hình thang là :
30 x 2 : 5 = 12 ( cm )
Diện tích hình thang là :
( 24 + 16 ) x 12 : 2 = 240 ( cm2 )
Đáp số : 240 cm2
Cho hinh thang co duong cao 10 cm . Hieu hai day la 22 cm . Keo dai day nho bang day lon de thanh hinh chu nhat co chieu dai bang day lon, chieu rong bang chieu cao hinh thang . Dien tich duoc mo rong them bang 1/7 dien tich hinh thang cu.Phan mo rong ve phia ben phai co dien tich 90cm vuong .Hay tinh day lon cua hinh thang ban dau
mot hinh thang co day be bang 3/5 day lon va co chieu cao bang 23cm.Nguoi ta mo rong hinh thang bang cach keo dai day be cho bang day lon da duoc1 hinh chu nhat ,sau khi mo rong thi dien tich tang them 207cm vuong .Tinh dien tich hinh thang luc chua mo rong?
Mot manh dat hinh thang co day lon bang 75m,day be bang 75% day lon va bang chieu cao.
a,tinh dien tich hinh thang do
b,neu nguoi ta muon tang dien tich manh dat hinh thang them 75m22 nua thi phai keo dai day be them bao nhieu m?
giai bai toan 1 hinh thang co day be bang 54 cm day lon 96 cm neu keo dai day lon them 10 cm thi dien tich tang len 80 cm2 tinh dien tich hinh thang
a)Mot hinh tam giac ABC co day BC la 34,5dm. Neu keo dai canh BC ve phia C mot doan bai 7 dm thi dien tich tang them 42 dm2 .Tinh dien tich hinh tam giac ABC.
b)Mot hinh thang co tong hai day la 78dm,day lon bang 7/6 day nho .Chieu cao bang 1/2 day lon .Tinh dien ich hinh thang do
1. Cho hinh thang co day be =3/5 day lon, chieu cao 23cm. Keo dai day be= day lon duoc hinh chu nhat dien tich tang len 207 cm2. Tinh dien tich hinh thang ban dau.
2. Mieng dat hinh thang co dien tich 1053 m2. Neu tang day be 4m duoc hinh thang co dien tich bang 1107m2. Tim do dai moi day biet day lon hon day be 6m.
3.Hinh thang co trung binh cong hai day 31cm. tang day be 3cm, day lon 6m thi dien tich tang len 36cm2. Tim dien tich hinh thang.
4.Cho tam giac ABC. Tren AB lay AM bang 1/3 AB,tren AC lay AN bang NCx2.
a) BN cat CM tai O.So sanh dien tich BOM va ONC.
b) Tinhdien tich ANB/ dien tich ABC.
c)Tinh dien tich tam giac ABC biet dien tich tam giac AMN= 16cm2.
