a) 4n=256
=>4n=44
=>n=4
b) 620.64n=6200
=>620+4n=6200
=>20+4n=200
=>4n=200-20
=>4n=180
=>n=180:4
=>n=45
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a) 4n=256
=>4n=44
=>n=4
b) 620.64n=6200
=>620+4n=6200
=>20+4n=200
=>4n=200-20
=>4n=180
=>n=180:4
=>n=45
Tim n thuoc Z biet: 4n+7/2n-3
tim n thuoc z biet 4n-1 chia het cho 2n+3
tim x thuoc Z biet
a)4n-5 chia het cho n
b)-11 la boi cua n-1
c)2n-1 la uoc cua 3n +2
tim x thuoc Z biet
a)4n-5 chia het cho n
b)-11 la boi cua n-1
c)2n-1 la uoc cua 3n +2
Tim n thuoc so tu hien biet
6n+9 chia het cho 4n -1
Tim gia tri lon nhat cua phan so M=6n-3/4n-6 khi do n=? biet n thuoc N
tim a,b.c biet a thuoc n, b thuoc n, c thuoc n:a nhan bc = 145
Tim a thuoc N , biet
a) a mu x = 1 (x thuoc N*)
b) ax = 0 ( x thuoc Nx)
tim x thuoc N biet :a,(2 nhan x cong 1 ) binh phuong 2 =625