Bài 5:
`a, 15^8 . 9^4`
= `( 3 . 5 )^8 . ( 3^2 )^4`
= `3^8 . 5^8 . 3^8`
= `( 3 . 5 . 3 )^8`
= `45^8`
`b, 27^5 : (-7)^15`
= `( 3^3 )^5 : (-7)^15`
= `3^15 : (-7)^15`
= `( 3 : (-7) )^15`
= `(-3/7)^15`
`c, 9 . 3^2 . 1/81 . 3^2`
= `9 . 9 . 1/81 . 3^2`
= `81 . 1/81 . 3^2`
= `3^2`
`d, 20^10 : 2^20`
= `20^10 : ( 2^2 )^10`
= `20^10 ; 4^10`
= `( 20 : 4 )^10`
= `5^10`
`a)`
`15^8 . 9^4`
`= 15^8 . (3^2)^4`
`= 15^8 . 3^8`
`= 45^8`
`b)`
`27^5 : (-7)^15`
`= (3^3)^5 : (-7)^15`
`= 3^15 : (-7)^15`
`= (-3/7)^15`
`c)`
`9 . 3^2 . 1/81 . 3^2`
`= 3^2 . 3^2 . (1/9)^2 . 3^2`
`= (3 . 3 . 1/9 . 3)^2 `
`= 3^2`
`d)`
`20^10 : 2^20`
`= 20^10 : (2^2)^10`
`= 20^10 : 4^10`
`= 5^10`
Cho a, b,c là các số dương CMR : (1+ $\frac{2c}{a+b}$)(1+ $\frac{2b}{c+a}$)(1+ $\frac{2a}{b+c}$) ≥ 8 Giúp mình với :(
viết lời giải chi tiết giúp mk vs mk cảm ơn mk cần gấp ạ
làm câu vn ý ạ mình cảm ơn làm đc mình cho 5 sao ạ
Em hãy thuyết trình ngắn về một trong hai câu ca dao sau: 1. Những người tính nết thật thà Đi đâu cũng được người ta tin dùng. 2. Của phi nghĩa có giàu đâu Ở cho ngay thẳng giàu sau mới bền.
Help me gấp + Đáp án chính xác nhất
Giúp mình câu này vs ak cảm ơn nhìu ak
Paying in cash entitles you to a special discount. => (PROVIDED) You are entitled to a special discount________________ in cash. They didn't go on a picnic because it was raining heavily. => (RAIN) But______________, they would have gone on a picnic. It is possible that your flight will be delayed, so take a book to read. => (CASE) Take a book to read ________________delayed. John had better call the police if he notices any suspicious characters. => (SHOULD) John had better call the police _______________ any suspicious characters. * It would be foolish of him not to consider this opportunity. => (IF) It would be foolish of him __________________ this opportunity. They missed the turn because they didn't see the sign. => (WOULD) They________ the turn if they had seen the sign. * The doctor warned him to quit smoking so that his health wouldn't deteriorate. => (UP) The doctor warned him that his health would deteriorate if ________ smoking. * He has twisted his ankle, so he can’t play tennis this afternoon. => (NOT) Had ____________, he would have been able to play tennis this afternoon. * I wouldn't have succeeded if my parents hadn't encouraged and supported me. => (BUT) I wouldn't have succeeded ______________and support.
giải giúp mình bài 1 2 4 với ạa
CTLHH and 5A...........................................
Cali Devil Bona Tone đen/đỏ Chữ trắng P/s. Tone theo cái tóc nài đc ko?
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