mot hinh chu nhat co chieu rong bang 1/3 chieu dai .neu keo dai moi chieu them 4 cm thi duoc hinh chu nhat co chu vi moi la 128 cm .tinh chu vi hinh chu nhat ban dau
mot hinh chu nhat co chieu rong bang 1\3 chieu dai neu keo dai moi chieu them 4cm thi duoc hinh chu nhat moi co chu vi banh 128 cm ting chu vi hinh chu nhat ban dau
mot hinh chu nhat co chieu rong bang 1/4 chieu dai.neu keo them chieu dai 12m,chieu rong 102m thi duoc hinh vuong.tinh chu vi va dien tich hinh chu nhat ban dau?(trong 30 phut thoi nha,minh gap lam)
mot hinh chu nhat co chieu rong = 1/3 chieu dai neu keo dai moi chieu them 4cm thi duoc hiNHchu nhat co chu vi bang 128cm tinh chu vi hinh chu nhat ban dau
chu vi cua hcn la 72cm neu giam chieu dai di 1/5 do dai cua no va tang chieu rong len 1/4 do dai cua no thi duoc hcn moi bang chu vi hcn ban dau . tinh dien tich hinh chu nhat
mot hinh chu nhat co chu vi la 960m.neu giam chieu dai 15m,tang chieu rong cung 15m thi duoc mot manh dat hcn moi hon dt hcn ban dau la 3375m vuông.tinh dt manh dau ban dau
bai 1,Viet cac phan so thap phan sau duoi dang so thap phan
24 /10=
225 /100 =
6453 / 1000 =
25789 /10000=
bai 2, Mot hinh chua nhat co chieu rong bang 1/3 chieu dai .Neu keo dai moi chieu them 4 cm thi duoc hinh chu nhat moi co chu vi bang 128cm.Tinh chu vi hinh chu nhat ban dau
bai 1 mot hinh chu nhat co chieu rong bang 3/5 chieu dai . Neu thu hep moi chieu di 8m thi 8m thi dien tich hinh chu nhat giam di 1024m2 . tinh dien tich hinh chu nhat sau khi duoc thu hep
bai 2 mot mieng dat hinh chu nhat co chieu dai 64m , chieu rong 34m . nguoi ta giam theo chieu dai va tang chieu rong de mieng dat la hinh vuong biet phan dien tich giam theo chieu dai la 272. tinh phan dien tich tang them theo chieu rong
bai 3 Mot hinh chu nhat co chieu ronh bang 3/4 chieu dai. Neu thu hep moi chieu 4m thi dien tich giam di 208m2. tih dien tich hinh chu nhat ban dau.
bai 4 Mot hinh chu nhat co chu vi gap 6 lan chieu rong. Neu mo rong chieu dai va chieu rong moi chieu 5m. Thi duoc hinh chu nhat moi co dien tich moi hon dien tich hinh chu nhat cu la 205 m2. Tinh dien tich hinh chu nhat ban dau.
1 hinh chu nhat co chieu dai gap 3 lan chieu rong.neu bot chieu dai di 3 m,bot chieu rong 2 m thi duoc 1 hinh chu nhat moi co chu vi gap 10 lan chieu rong.tinh chu vi hinh chu nhat ban dau