Đáp án+Giải thích các bước giải:
`d)(n+22) vdots (n+1)`
`=>n+1+21 vdots n+1`
`=>21 vdots n+1`
`=>n+1 in Ư(21)={+-1,+-3,+-7,+-21}`
`=>n in {0,-2,2,-4,6,-8,20,-22}`
`e)(2n+23) vdots (n-1)`
`=>2n-2+25 vdots n-1`
`=>2(n-1)+25 vdots n-1`
`=>25 vdots n-1`
`=>n-1 in Ư(25)={+-1,+-5,+-25}`
`=>n in {0,2,-4,6,26,-24}`
`text{a) Ta có : n + 22 ⋮ n +1}`
`=> n+ 1+22: n+1`
`text{Vì n+1: n+1 nên 22 : n+1}`
`=> n + 1 ∈ Ư(21)`
`=> n+ 1 ∈ { 1,3,7,21,-1,-3,-7,-21}`
`=> n ∈ { 0 , -2 ,2 ,-4,6 ,-8,20,-22}`
`text{e) Ta có : ( 2n + 23 )⋮ ( n – 1).}`
`=> 2n -2 + 25 ⋮ n -1 `
`=> 25 ⋮ n-1`
`=> n-1 ∈ Ư(25) `
`=> n-1 ∈ { 1 , 5,25 , -1,-5,-25}`
`=> n ∈ { 0 ,2, -4,6 ,26,-24}`
3(x+1)=4(y-2);2x+7y=70 Em cần trong vòng 5 phút ạ
phân tích thành nhân tử phương pháp dùng hằng đẳng thức 1,(x-5)^3-27 2,m^3-3m^2+3m-1 3,64-48+12m^2-m^3 4,27a^3-54ab+36ab^2 5,x^3+6x^2+12x+8 giải chi tiết nhé các bn tks nh
Nêu công lao của họ Khúc và họ Dương đối với lịch sử dân tộc ở đầu thế kỉ 10.Ý nghĩa của những đóng góp đó Mong mn trả lời!!!
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Giải thích cho em với Ctlhn với 5*
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