Mot thua ruong hinh thang co do ai day nho la 15 m,day lon bang 160 % day nho.Chieu cao bang hieu giua day lon va day nho .Hoi:
a)Dien tich cua thua ruong do bang bao nhieu met vuong?
b)Khoi luong thoc thu duoc tren thua ruong do la bao nhieu ta,biet rang cu 10m2 thi thu duoc 12kg thoc ?