tinh dt 1 hcn co cd la 36cmbiet neu tang cd them 4cm,giu nguyen cr thi dt hcn tang them 92cm vuong

tinh s hinh chu nhat bet  neu tang chieu dai hcn do them 7cm va gỉ nguyen chieu dong thi dien tich tang them 119met vuong va neu giu nguyen chieu dai va giam chieu dong di 3 cm thi s giam di 84 cm met vuong

Mieng bia hcn co chu vi gap 5 lan CR . Neu tang CR them 9 cm , tang CD them 4 cm thi duoc mot hinh vuong . Tim DT mieng bia ban dau
 

mot khu dat hcn co chu vi bang 102 neu tang chieu rong 6m va giu nguyen chieu dai thi dien tich khu dat tang 216m vuong tinh dien tich ban dau cua khu dat la ...

mot hcn co chieu dai gap ruoi chieu dai neu moi chieu tang them mot 1m thi duoc mot hcn moi co dt tang them 26m2 tinh chu vi hcn ban dau

Mot hcn co cd gap ruoi cr .neu moi chieu tang them 2m thi hcn moi co dien tich tang them 64m2.tinh dt ban dau hcn

HCN co chu vi 56 cm neu tang chieu dai them 2 cm va giu nguyen chieu rong thi CVHCN moi lA

1 manh vuon hcn co chieu dai = 2 lan chieu rong . neu cr tang 2 m va giam cd 2 m thi dt manh vuon tang 12 m2 . tinh dt manh vuon

CV HCN =140m. Giu nguyen CD, tang them 1/3 cua CR thi luc do HCN -> HV. Tim DT HCN.