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Bài 4: Link đây bạn tham khảo nha
https://olm.vn/hoi-dap/tim-kiem?q=Cho+h%C3%ACnh+ch%E1%BB%AF+nh%E1%BA%ADt+ABCD+(chi%E1%BB%81u+r%E1%BB%99ng+l%C3%A0+AB)+c%C3%B3+di%E1%BB%87n+t%C3%ADch+l%C3%A0+2800+cm2,l%E1%BA%A5y+%C4%91i%E1%BB%83m+M+tr%C3%AAn+AB+sao+cho+:+AM=15cm;+MB=25cm.T%C3%ADnh+di%E1%BB%87n+t%C3%ADch+h%C3%ACnh+thang+AMCD?+++++++++++A+B+M+C+D++&id=118453
Học tốt nhé!
câu 1:
chiều dài là a;chiều rộng là b;diện tích tam giác là a.h/2(a là đọ dài cạnh đáy,h là chiều cao tương ứng)
câu 2:
0
....(nản.thi vio phải ko)_
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a. chiều dài sân bóng là \(14-1\times2=12m\)
chiều rộng sân bóng là \(12-2\times1=10m\)
Diện tích sân bóng là :\(10\times12=120m^2\)
b. Diện tích mảnh đất là : \(14\times12=168m^2\)
Diện tích phần đường đi là : \(168-120=48m^2\)
c. Số hàng gạch theo chiều dài là : \(12:0,5=24\text{ hàng}\)
Số hàng gạch theo chiều rộng sân là : \(10:0,5=20\text{ hàng}\)
Số viên gạch cần tới là : \(24\times20=480\text{ viên}\)