Bai 1; Cho hinh thang abcd co day cd gap 3 lan day ab cac canh ben da va cb keo dai cat nhau tai e.
a/So sanh AE voi ED, EB voi EC
b/Tinh dien tich hinh thang biet dien tich tam giac EAB la 4 cm2
Bai 2; Tim chu so tan cung cua tong sau. hay giai thich:
(21 x 22 x 29 x 36 x 74 x 65) + ( 94 x 104 x 24 x 64 x 84)
Bai 3; ban an luc 7 gio di tu a den b voi van toc la 12 km/h. mot gio sau ban dung duoi theo voi van toc la 16 km/h. den may gio thi ban dung duoi kip ban an ?