Vì \(\frac{a}{b}\)< 1 => a < b => a+n<b+n
=>an + ab < bn + ab
=>a(n +b) < b (n+a)
=>\(\frac{a}{b}\)<\(\frac{a+n}{b+n}\)
Vì \(\frac{a}{b}\)< 1 => a < b => a+n<b+n
=>an + ab < bn + ab
=>a(n +b) < b (n+a)
=>\(\frac{a}{b}\)<\(\frac{a+n}{b+n}\)
Cho 3 so tu nhien A,B,C co tong la 6850 , trong do so A be hon so B la 25 don vi , so A be hon so C la 45 don vi .Tim moi so
cho 3 so tu nhien A,B,C CO TONG LA 5850 . trong do so A be hon so b 15 don vi , so b be hon so c la 30 don vi . tim so c
cho 3 so tu nhien abc co tong la 5850 trong do so a be hon so b la 15 don vi. so b be hon so c 30 don vi tim so c
cho 3 so tu nhien A,B,C co tong la 58.50 so A be hon so B 15 don vi so B be hon so C 30 don vi tim so C
cho 3 so tu nhien A,B,C co tong la 58.50 so A be hon so B 15 don vi so B be hon so C 30 don vi tim so C
1. Tim x la so tu nhien be nhat sao cho :
( x - 8,25 * 4 ) : ( x - 8,25 * 4 ) = 1
2. Tim so a , biet a la tu nhien le nho hon 100 va trong phep chia a cho b duoc thuong la 3 du 22
cho ps 34/41 . tim so tu nhien n biet neu bot n o tu so va them n vao mau so co gia tri la 2/3 ?
tinh gia tri bieu thuc
a/ A= (100 - 1).(100-2)...(100- n) voi n la so tu nhien khac 0,va tich tren co dung 100 thua so
b/B= 13a +19b+4a-2b voi a+b=100
cho 2 phan so 6/7 va 2/9 hay tim p/s a/b sao cho khi them ab/ vao 2 p/s da cho thi ty so cua 2 p/s la 3
cho 2 phan so 6/7 va 1/9 hay tim p/s a/b sao cho khi them a/b vao 1/9 va bot a/b o 6/7 thi ta duoc 2 p/s co ty so la 3
viet duoc bao nhieu p/s ma tong cua tu so va mau so 2012 co bao nhieu p/s nho hon 1 bang 1 lon hon 1
tim hai so chan co tong la 2100 biet giua chung co 18 so chan khac tim 2 so tu nhien biet tong cua hai so nay la 2019 giua chung co tat ca 20 so tu nhien khac
ai nhanh minh tick 5 lan giai han bai giai ra nha