tim x:
x + 5/6 =4 * 5/12
x * 5/4 = 2 - 4/7
Tim a la 1 so tu nhien biet : 4<a+1<5.Tim a ?
tim 4 phan so nam giua 2 phan so 3/5 va 4/5
tim mot so tu nhien co 5 chu so biet 5 chu so do viet nguoc lai thi gap 4 lan so phai tim
tim 4 phan so nam giua 4/5 va 4/6
tim 1 ps = 3/4.biet neulay ts+5 ta duoc ps moi=4/5
Tim tong cac so co 4 chu so chia cho 5 du 2.tong can tim
Tim x
x: 4/5 =5/2
tim x:
x : 5 = 4 (du 4)