... .435853.4358.438581.5358.4385.5353.81/412 7 18 7 1811.12 7 18 7 .12 7 12 7 .1811/352929 7 .5292.529 7 .52/2 77 ,2)15,3(38,0]15,3).8.(125,0[)38,0.4,0.5,2()]8.(15,3.125,0[)4,0.38,0.5,2/(1−=−+=−++−=−+−+−=−−=−−−=+−=−+−=−−−=−−−=−−−Bài ... 14,61 – 7, 15 + 3,2Caùch 1: 14,61 – 7, 15 + 3,2 ≈ 15 – 7 + 3 ≈ 11Caùch 2: 14,61 – 7, 15 + 3,2 = 7, 46 + 3,2 = 10,66 ≈ 11b/ 7, 56 . 5, 173 Caùch 1: 7, 56 . 5, 173 ≈ 8 . 5 ≈ 40.Caùch 2: 7. 56 ... về nhà .Tính được :1555 ,7 5,231155;315 ,7 5,2==>==Học sinh phát biểu định nghóa tỷ lệ thức .51 7: 522 #7: 2133151 7: 522;21 7 1.2 7 7:213/8:544:5210181.548:54;10141.524:52/−−=>−=−−=−=−==>====ba=>...