phan so 2/3 tu so 2,mau so 3
phan so 2/10 tu so 2,mau so 10
phan so 20/55 tu so 20 ,mau so 55
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Quy đông mau so hai phan so 2/3 va 5/12 (chon 12 la mau so chung (msc) de quy đông mau so hai phan so tren).
dua cac phan so ve cung mau so roi sap xep theo thu tu tu be den lon 2 phan 7 6 phan 14 30 phan 35 3 phan 21 2 phan 5 9 phan 45 8 phan 10 12 phan 20
1,
Tong cua tu so va mau so cua mot phan so nho hon 1bang 120 sau khi rút gon ta được 3/5 . Tim phan so do
2,
Tong cua tu so va mau so cua mot phan so = 92 . Hieu cua tu so va mau so = 22 .Tim phan so do
3,
Tông phan so co tu so =6 nam giua 2 phan so 1/3va1/4
viet cac phan so sau day thanh cac phan so co mau so la 10:
1/2 , 2/5 , 1/4 , 18/20 , 15/50 , 10/25 .
1,
Tim 1 phan so biet tu so hon mau so 8 don vi va ti so cua tu so va mau so la 5/3
2,
Hay viet cac phan so co mau so la 9 va nam giua 2 phan so 6/18 va 16/27
3,
Hay viet 4 phan so khac nhau sao cho moi phan so lon hon 5/6 va be hon 6/7
quy dong mau so 3 phan so 1 phan 4 ; 1 phan 2 ; va 1 phan 3
Cho phan so 3 phan 7.Neu cong them vao tu so va mau so do voi cung mot so tu nhien thi duoc mot phan so moi bang phan so 2 phan 3.Tim hai phan so do.
Cho phan so 3 phan 7.Neu cong them vao tu so va mau so cua phan so do voi cung mot so tu nhien thi duoc mot phan so moi bang phan so 2 phan 3.Tim hai so do.
Tim mot phan so biet rang neu cong them 4 vao tu so va giu nguyen mau so thi phan so moi bang 1,neu cong them 3 vao mau so va giu nguyen tuso thi duoc phan so moi bang 1/2
quy dong mau so cac phan so
4 phan 3; 1 phan 2 va 3 phan 5=
5 phan 6;7 phan 8;13 phan 24=
u so cac phan so