may bn giup mk vs nha
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cmr ( a, b ) = 1 khi va chi khi a mu 2 + 5 chia het cho 6
cho ( a,b ) = 1 , c thuoc N , ab = c mu 2 . cmr a,b la cac so chinh phuong
CMR neu A=111...1(200 chu so 1) va B=222...2 (100 chu so 2) thi A-B la mot so chinh phuong
1/Hãy tìm 10000000000 so tu nhien lien tiep deu la hop so
2/CMR: neu a chia het cho b va b chia het cho a thi a=b hoac a=-b (a,b thuoc N)
Tim y thuoc N: y+50 va y-23 deu la cac so chinh phuong
neu a la so gam 200 chu so 1 va B la so gom 100 chu so 2 CMR A-B la so chinh phuong
CMR neu p la tich cua n so nguyen to dau tien (n>1) thi p-1 va p+1 khong the la cac so chinh phuong
giup mk vs nha may bn
chung minh rang neu A la so gom 200 chu so 1 va 100 chu so 2 thi A-B la so chinh phuong
voi 2 so nguyen to cung nhau neu 2 so nguyen to cung nhau co tich va so ching phuong thi 2 so deu la so chinh phuong
cmr
neu n la so tu nhien n+1 va 2n+1 la so chinh phuong thi n la boi cua 24
giai co loi giai ai dung minh tick