n-6 chia het cho n-1

n-1-5chia het cho n-1

5chia het cho n-1

n-1 la uoc cua 5

thay gia tri roi tinh n nhe,sorry vi mk ko the lam het cho pan dk

|a|=2=>a=2 hoac a=-2

voi a=2:

M=2+2.2.2-2

M=10-2=8

voi a=-2:

M=(-2)+2.(-2).2-2

M=-12

x^2=5x

=>x^2:x=5

=>x=5

vay x=5

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Gọi 2 số là a; b ( Coi a < b) => a+ b = 270

ƯCLN (a;b) = 45 => a = 45m; b = 45n  (m < n ; m;n nguyên tố cùng nhau)

=> a+ b = 45. (m +n) = 270 => m + n = 6  = 1+ 5 = 2 + 4 = 3+ 3 

m < n và m; n nguyên tố cùng nhau nên m = 1 ; n = 5 

+) m = 1 ; n = 5 => a = 45 ; n = 225