tính:a,27^64: 81^20 b,(1 phần 8)^20:( 1 phần 16)^9 c, 1 phần 3: 1 phần 5- 1 phần 6 d, 8 phần 15 - 8 phần 31- 8 phần 47+ 8 phần 59 trên -1+15 phần 31+ 15 phần 47- 15 phần 59 mọi người ơi, giúp mik với...

thach2k1

2 năm trước

Loga Sinh Học lớp 12

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nhung714

Hướng dẫn trả lời:

a) `27^64 ÷ 81^20`

`= (3^3)^64 ÷ (3^4)^20`

`= 3^192 ÷ 3^80`

`= 3^{112}`

b) `(1/8)^20 ÷ (1/16)^9`

`= [(1/2)^3]^20 ÷ [(1/2)^4]^9`

`= (1/2)^60 ÷ (1/2)^36`

`= (1/2)^24`

c) `1/3 ÷ 1/5 - 1/6`

`= 1/3 . 5/1 - 1/6`

`= 5/3 - 1/6`

`= 10/6 - 1/6`

`= 9/6`

`= 3/2`

d) `{8/15 - 8/31- 8/47 + 8/59}/{-1 + 15/31 + 15/47- 15/59}`

`= {-8/15.(-1) - 8/15. 15/31 - 8/15. 15/47 - 8/15. (-15/59)}/{-1 + 15/31 + 15/47- 15/59}`

`= {-8/15.(-1 + 15/31 + 15/47 - 15/59)}/{-1 + 15/31 + 15/47- 15/59}`

`= -8/15`

Đáp án:

a) `= 3^{112}`

b) `= (1/2)^24`

c) `= 3/2`

d) `= -8/15`

Vote (0) Phản hồi (0) 2 năm trước

samphuong

`a)`

`27^64 : 81^20`

`= (3^3)^64 : (3^4)^20`

` = 3^192 : 3^80`

` = 3^112`

`b)`

`(1/8)^20 : (1/16)^9`

` = [(1/2)^3]^20 : [(1/2)^4]^9`

` = (1/2)^60 : (1/2)^36`

` = (1/2)^24`

`c)`

`1/3 : 1/5 - 1/6`

`= 5/3 - 1/6`

`= 10/6 - 1/6`

` = 3/2`

`d)`

`(8/15 - 8/31- 8/47 + 8/59 )/(-1 + 15/31 + 15/47 - 15/59)`

` = (8 . (1/15 - 1/31 - 1/47 + 1/59))/(-15(1/15 - 1/31 - 1/47 + 1/59))`

`= 8/(-15)`

`=-8/15`

Vote (0) Phản hồi (0) 2 năm trước

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