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Mẫu số <30 và chia hết cho 2 và 3 là {6;12;18;24}, do mẫu số phải khác 0 nên loại 0
Vậy phân số cần tìm là: 5/6;5/12;5/18; 5/24
bài 3
Tử số là:
( 25 – 7 ) : 2 = 9
Mẫu số là:
9 + 7 = 16
Vậy phân số cần tìm là: \(\dfrac{9}{16}\)
Đáp số là có 6 số.Những số đó là:98789 ; 88988 ; 99599 ; 79997 ; 97979 ; 89798
999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
a) \(\frac{3}{7};\frac{7}{3};\frac{3}{13};\frac{13}{3};\frac{3}{29};\frac{29}{3};\frac{7}{13};\frac{13}{7};\frac{7}{29};\frac{29}{7};\frac{13}{29};\frac{29}{13}\)
b)\(\frac{9}{5};\frac{53}{5};\frac{75}{5};\frac{53}{9};\frac{75}{9};\frac{75}{53}\)
c)\(\frac{1}{8};\frac{8}{1};\frac{2}{7};\frac{7}{2};\frac{3}{6};\frac{6}{3};\frac{4}{5};\frac{5}{4};\frac{0}{9};\frac{9}{0}\)
TL :
Các số tự nhiên bé hơn 6 là : 0 ; 1 ; 2 ; 3 ; 4 ; 5
Vì có 1 chữ số là 6 và chữ số hàng chục lớn hơn chữ số hàng đơn vị nên :
Các số đó là :
- 60 ; 61 ; 62 ; 63 ; 64 ; 65 .
3/5
3/17
5/3
5/17
17/3
17/5
Cảm ơn bạn