Các câu hỏi tương tự
Tinh dien tich cua thua ruong hinh chu nhat co chu vi la 360 cm.Biet rang,neu tang chieu rong 25 m va giam chieu dai 5 m thi thua ruong co dang hinh vuong.
Mot thua ruong co chu vi 180 m.Neu tang chieu rong them 5m va giam chieu dai di 5 m thi duoc thua ruong hinh vuong.
Tinh dien tich cua thua ruong hinh chu nhat ban dau.
thua ruong hinh chu nhat co chu vi gap 8 lan chieu rong. neu tang chieu rong 13 met va giam chieu dai 17 met thi thanh hinh vuong. tinh dien tich thua ruong do
hai thua ruong hinh chu nhat co tong chu vi la 420m. Neu thua ruong thu nhat giam chieu dai di 5m; tang chieu rong them 2m thi duoc thua ruong moi co chu vi bang chu vi thua ruong thu hai Tinh moi thua ruong ban dau
1.manh vuon hinh chu nhat co chu vi la 120 . Tinh dien tich hinh chu nhat biet neu tang chieu rong len 5m va giam chieu dai 5m thi thua ruong thanh hinh vuong .
chu vi thua ruong hinh chu nhat la 110 m neu tang chieu dai 4m giam chieu rong 7 m thi chieu rong bang 1/3 chieu dai nguoi ta trong lua cu 1/2 dien tich thu hoach duoc 3 kg thoc hoi ca thua ruong
mot hinh chu nhat co chieu dai hon chieu rong 320m chieu rong bang 1/5 chieu dai.
a) tinh chu vi va dien tich hinh chu nhat do.
b) phai bot chieu dai va tang chieu rong them bao nhieu met de hinh chu nhat tro thanh hinh vuong ma chu vi khong thay doi
2.
mot thua ruong hinh chu nhat co chu vi la 360m , chieu dai . tinh dien tich thua ruong .
mot thua ruong hinh chu nhat co chu vi 100 m nguoi ta tang chieu dai len 1/3 chieu dai thi chu vi hinh moi la 120 m tinh dien tich thua ruong ban dau
mot thua dat hinh chu nhat co chu vi la 106m.neu giam chieu dai 5m,tang chieu rong 5m thi dien tich cua hinh khong thay doi .tinh dien tich thua ruong do