199...999/999...995
=199...999/199...999 nhân 5
=1/5
Tck cho mik nhe
199...999/999...995
=199...999/199...999 nhân 5
=1/5
Tck cho mik nhe
Rut gon phan so
\(\frac{199...9}{999...5}\)(100 cs 9 o tu va mau)
rút gọn phân số: 1999...999/99..995( 10 chu so 9 o tu,10 chu so 9 o mau)
cho M= 1+2+3+....+9 tren 11+12+13+...+19
a) rut gon M
b) hay neu cach xoa mot so hang o tu va xoa mot so hang o mau cua M de duoc mot phan so co gia tri van bang M
hieu cua tu va mau la 9 .dong thoi sau khi rut gon phan so do la 5/2 . tim phan so do
tìm phân số biết tong cua tu va mau la 25 va khi rut gon thi duoc phan so -2/3
hieu vua mau va tu la 140 va khi rut gon phan so do thi duoc phan so 2/3
tim bon so tu nhien lien tiep sao cho tich cua chung bang 57120 cho phan so 95/140 bot tu so va mau so cho cung mot so a thi ta co phan so moi rut gon thanh 3/5 tim so a?
tong cua tu so va mau so cua mot phan so la 4812 sau khi rut gon phan so do ta duoc phan so 5/7 hay tim phan so chua rut gon
cong ca tu va mau cua phan so 31/38 voi 1 so a rut gon bang 5/6.tim so a
Cho phan so A= \(\frac{1+3+5+...+19}{21+23+25+...+39}\)
a) Rut gon phan so A
b) Hay xoa 1 so hang o tu va mau de duoc 1 phan so moi bang phan so A