... tính bằng cách hợp lía) 14 17 94 7 518 17 12511++−−b) 1212313414433322211−−−−−−+−+−+−Bài làm.1a) 125112121125119418 17 7514 17 12511=−+=−−−+b)111144143313221214)33()22()11(=−−−=+−+−+−++−++−++−Bµi ... : −×−++×−)15,25 57, 28(:84,64)81,3306,34()2,18,0(5,2)1,02,0(:3 + 32: 214Bài làm 21 7 2 7 132262 7 213:262 7 21530:262 7 42,3:84,6425,025,21,0:3:26=+×=+=++=+×+×=ABài ... −==⇔−=+=+⇔=++−=+−=−+−−=−−+1528346,1546,1546,1154 75 ,315,215415, 275 ,315415, 275 ,3154xxxxxxxxBài 4. T×m x, biÕt:a.−−=+315231xb.−−=−5341 7 3xKQ: a) x = 52; b)...