... dcba=3 1 333 1 *32233 1 *33 1 143 1 /8 427 ,15 73,022573,0/72 ,1/ 65,25,2/5 11 7 12 11 : 12 74 1 65. 12 11 6525,0. 12 11 /4494357:35437354.575473.52 1/ 3 11 8 83.336433 31 1 8 3:/25,353: 10 21 10 21 .53 /1 −==>−=+==>=+=>=+=>−=−+±==>−==>=+∅∈=>−=±==>=−==>−=−=−=+−−==>−=−−=−=+−==>−=−=−==>−==−xxxxxxxxxxxxxxxxxxxxxxxxxxxDạng ... hai cách :a/ 14 , 61 – 7 ,15 + 3,2Cách 1: 14 , 61 – 7 ,15 + 3,2 ≈ 15 – 7 + 3 ≈ 11 Cách 2: 14 , 61 – 7 ,15 + 3,2 = 7, 46 + 3,2 = 10 ,66 ≈ 11 b/ 7,56 . 5 ,17 3Cách 1: 7,56 . 5 ,17 3 ≈ 8 . 5 ≈ 40.Cách ... tính? 16 7 12 5 /1 + ?43:322 1 :32/2+ 19 17 13 . 8 1 3 19 17 11 . 8 1 3/3−?Câu 4: Tìm x biết: 1/ x + 8, 9 = 9 2/ 2 + 3.x = 2 1 −.3/ 2 1 :3234−=−x 4/ (x – 4)2 = 9 1 ?Câu...