4phan 3 tru 11 phan 15
1 13 phan 15 nhan 0 phay 75 tru (11 phan 20 cong 25 phan tram ) chia 7 phan3
Cho a=1 Phan 11 +1phan 12+1phan 13+...+1phan 70
Chứng minh A>4phan 3
3 phan 2 cong 4phan 3
\(\dfrac{3}{2}+\dfrac{4}{3}=\dfrac{9}{6}+\dfrac{8}{6}=\dfrac{9+8}{6}=\dfrac{17}{6}\)
phan so bang 4phan 6 la
a 1phan2
b 8 phan 24
c 10 phan 15
d 16 phần 18
tim mot phan so co mau la 11 biet rang khi tu tru 18 va nhan mau voi 7 thi duoc mot phan so bang phan so da chotim mot phan so co mau la 11 biet rang khi tu tru 18 va nhan mau voi 7 thi duoc mot phan so bang phan so da cho
5 phan12 tru 7 phan 12 chia 14 phan 11
\(\frac{5}{12}-\frac{7}{12}:\frac{14}{11}\)
\(=\frac{5}{12}-\frac{7.11}{12.14}\)
\(=\frac{5}{12}-\frac{11}{24}\)
\(=\frac{10}{24}-\frac{11}{24}\)
\(=\frac{-1}{24}\)
\(\frac{5}{12}-\frac{7}{12}:\frac{14}{11}\)
\(\frac{5}{12}-\frac{7}{12}.\frac{11}{14}\)
\(\frac{5}{12}-\frac{11}{24}\)
\(\frac{10}{24}-\frac{11}{24}\)
\(-\frac{1}{24}\)
viet cac ti so phan tram 50phan tram ;4phan tram;120phan tram ra so thap phan
\(50\%=\frac{50}{100}=0,5\)
\(4\%=\frac{4}{100}=0,04\)
\(120\%=\frac{120}{100}=1,2\)
tim mot phan so bang phan so 9/10 neu tu so cua phan so tru di 15 va giu nguyen mau so thi ta duoc phan so moi bang phan so 3/4
cho hai phan so 7/9 va 3/11 tim phan so a/b sao cho dem moi phan so nhan tru cho a/b thi duoc phan so moi co ti so la 5