Trình bày lời giải:
Câu `14.`
`a)`
`A=2^3+3:(-1/2)^0 . (1/2)^2 . 4-[(-2)^2:1/2]:8`
`A=8+3:1. 1/4 . 4-(4:1/2):8`
`A=8+3 . (1/4 . 4)-(4 . 2):8`
`A=8+3 . 1-8:8`
`A=8+3-1`
`A=11-1`
`A=10`
Vậy `A=10`
`b)`
`B=[9,6.(3/4-5/6)^2].[6.(-2)/3 +12. (-2/3)^2+12 . (-2/3)^2+18 . (-2/3)^3].(3/2)^2`
`B=[9,6.(9/12-10/12)^2].[6.(-2)/3 +12. 4/9 +12 . 4/9+18 . 4/9 . (-2)/3 ].9/4`
`B=[9,6.(-1/12)^2].[6.(-2)/3 +12. 4/9 +12 . 4/9-12 . 4/9 ].9/4`
`B=[9,6. 1/144].[6.(-2)/3 +4/9.(12+12-12) ].9/4`
`B=1/15 .[6.(-2)/3 +4/9. 12 ].9/4`
`B=1/15 .[-4 +16/3 ].9/4`
`B=1/15 .[-12/3 +16/3 ].9/4`
`B=1/15 . 4/3 . 9/4`
`B=1/15 . 3`
`B=3/15`
`B=1/5`
Vậy `B=1/5`
