... : 2 = :z8(dm 2 )- ('&%Z[*- HS <c Y, l m b ià àBµi gi¶iDiƯn tÝch h×nh thang ABED lµ:(1,6 + 2, 5) × 1 ,2 : 2 = 2, 46 (dm 2 ) 20 1,6dm 2, 5dm 1,3dmDHEBCA1,2dm 2. ... thang lµ:(50 + 70)× 40 : 2= 24 00 (m 2 )DiƯn tÝch trång ®u ®đ lµ: 24 00 × 30 : 100 = 720 (m 2 ) Sè c©y ®u ®đ trång ®ỵc lµ: 720 : 1,5 = 480 (c©y)b) T?Id5 24 00 :100 x 25 = ... )4•-+ Bài 2. - )<Y*)-A*- V[&I&S-EA'R*#.- @2* a) S = 3 × 4 : 2 = 6 (cm 2 ) b) S = 2, 5 × 1,6: 2 = 2 (m 2 ) c) S = n9...