Ngày thứ 2 đi được số km là :
85 + 30 = 115 ( km )
Trung bình mỗi ngày đi được số km là :
( 115 + 85 ) : 2 = 100 ( km )
Đáp số : 100 km
ai k mình mình k lại . xin cảm ơn
100km 100%đuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuug
Tính nhanh: 19998 + 2649 =