1 phan 5 nhan 8 cong 1 phan 8 nhan 11 cong 1 phan 11 nhan 14 +..........+1 phan x nhan (x+30+101 phan 1540
S= 1/3.5+1/5.7+1/7.9+...+1/97.99
(cac ban chu y: dau / la phan so va dau . la dau nhan)
tim phan so duong a/b nho nhat(a,b thuoc n *) sao cho khi nhan phan so do voi 24/5 va 16/3 deu duoc tich la so tu nhien
Cac ban giup minh nha, mai minh phai di hoc rui!!!
khong thuc hien phep nhan hay nhan xet xem moi tich sau tan cung boi chu so nao ?
a, 1 2 3 4 5 6 7 8 9
b, 1 3 5 7 9 11
Cho 2 tap hop
A={but,thuoc,tay}
B={cam,oi,nhan,mit,dua}
Hay viet tat ca cac tap hop gom 1phan tu cuaA va 3 phan tu cua B
Tim phan so toi gian biet khi cong ca tu va mau cua phan so ay voi mau so cua no ta duoc mot phan so moi lon gap 3 lan phan so ban dau.
GIUP MINH GAP NHOA!!!!!!!!!!!!!!!
Tim tat ca cac phan so co tu so la -15 lon hon -3/7 va ho hon 5/8
tim tat ca cac phan so co mau so la 12 lon hon -2/3 va nho hon 1/4
tim 1 phan so sao cho khi them 1 vao tu so va bot o mau so .ti phan so do =phan so 1/2
Cho phan so \(\frac{234}{369}\).Hoi phai cung bot o tu so va mau so bao nhieu don vi de duoc phan so moi,rut gon phan so moi ta duoc phan so \(\frac{5}{8}\)?