... (®iÓm)0,25(®iÓm)653318 142 415 142 415==++++===zyxzyx === 84 144 90zyx(0,5điểm)b, Ta có a-11b+3c 17 19 (a-11b+3c) 17 (0,25điểm)19a - 209b + 57c 17 (17a - 204b + 51c) + (2a ... 332)32(:) 4 5(:25681.625) 4 11.(0625,01−+.A = 278:) 64 125:169(25) 4 5.(25,012−+A= 4. 1625 + 25. 827.125.16 64. 9−(0,5®iÓm )A= 827.5 4. 9 4 25−+A= ... 827.5 4. 9 4 25−+A= 10 243 4 25−+.A= 2036120 48 6125202). 243 (5.25−=−=−+(0,5®iÓm )b)B =20.63.26.2 94 8810 945 +− = )5.2.()3.2(3.2)3.2.(2)3.()2(28810 942 52+−= )51(3.2)13.(3.25.323.2323.281039108108109101210+−=+−=...