viet cac phan so lan luot bang \(\frac{5}{6}\);\(\frac{3}{4}\)va co mau so chung la 12
\(\text{viet cac phan so lan luot bang 5/7; 4 va co mau so chung bang 7}\)
viet cac phan so lan luot bang 7 phan 9 va 5 phan 12 va co mau so chung la 36
viet cac phan so lan luot bang 7/9 , 5/12 va co mau so chung la 36
viet cac phan so lan luot bang 13 phan 36 va 17 phan 24 co mau so chung la 72
dung 9 chu so khac nhau va khac 0 viet cac phan so lan luot bang 1,2,3,4,5,6,7,8,9
1, Quy dong mau so cac phan so 5/12,2/3 , 3/4
2,viet cac phan so lan luot bang 5/12, 7/18 va co mau so chung la 36
ai lam dung truoc minh tick cho
Viet phan so : \(\dfrac{5}{7}\) thanh cac phan so co mau so lan luot la: 14 ; 28 ; 35 ; 105
\(\dfrac{10}{14};\dfrac{20}{28};\dfrac{25}{35};\dfrac{75}{105}\)
\(\dfrac{5}{7}=\dfrac{5\times2}{7\times2}=\dfrac{10}{14};\dfrac{5\times4}{7\times4}=\dfrac{20}{28};\dfrac{5\times5}{7\times5}=\dfrac{25}{35};\dfrac{2\times15}{7\times15}=\dfrac{30}{105}\)
viet 5 phan so bang 1 co tu so lan luot la 7,9,10,12,15? dang can gap
viet so tu nhien 13 thanh cac phan so co mau so lan luot la : 3; 5 ; 10 ; 17 .
\(\dfrac{13}{5};\dfrac{13}{3};\dfrac{13}{10};\dfrac{13}{17}\)
\(\dfrac{39}{3};\dfrac{65}{5};\dfrac{130}{10};\dfrac{221}{17}\)