6.42857142857

22 và 20 nha

5+8+9=22

3+8+9=20

\(5+8+9=22\)

\(3+8+9=20\)

6 + 9 + 3 + 6 = 24

1+6+3+8+9= 27

1+6+4+8+3+9 = 31

6 + 9 + 3 + 6

= 15 + 3 + 6

= 18 + 6

= 24

1 + 6 + 8 + 9

= 7 + 8 + 9

= 15 + 9

= 24

1 + 6 +4 + 8 + 3 + 9

= 7 + 4 + 8 + 3 + 9 

= 11 + 8 + 3 + 9

= 19 + 3 + 9

= 22 + 9

= 31

\(\left(\frac{4}{3}-\frac{2}{3}-\frac{9}{8}\right):\left(1-\frac{4}{5}\right)\)

\(=\left(\frac{2}{3}-\frac{9}{8}\right):\left(1-\frac{4}{5}\right)\)

\(=-\frac{11}{24}:\frac{1}{5}\)

\(=-\frac{55}{24}\)

-55/24

(4/3-2/3-9/8):(1-4/5)

=-11/24:1/5

=-79/120

k cho mk nhé,bn hok tốt

1+8=9

nhớ tk nha

Số cần tìm là :

1 + 8 = 9

Đáp số : 9

1+ 8 = 9 ~^^ tck nha

24;14;21

1 + 6 + 8 + 9 = 24

1 + 6 + 3 + 4 = 14

3 + 9 + 3 + 6 = 21

k mik nhé

=24

=14

=21

tử số = 2^10 . 3^8 - 2^10 . 3^9 = 2^10 . 3^8 . (1-3) 

mẫu số = 2^10 . 3^8 + 3^8 . 2^10 . 5 = 2^10 . 3^8 . (1+5)

Đ/S: \(\frac{1-3}{1+5}\)=\(\frac{-1}{3}\)

5.3.8.9.3682=3976560(chú ý . là phép nhân)

#)Giải :

\(\left[\left(-\frac{56}{64}\right)--\left(\frac{1}{9}\div\frac{8}{27}\right)-\frac{1}{3}\right]\div-\frac{81}{128}\)

\(\Leftrightarrow\left[\left(-\frac{7}{8}\right)-\left(-\frac{3}{8}\right)-\frac{1}{3}\right]\div\left(-\frac{81}{128}\right)\)

\(\Leftrightarrow\left(-\frac{5}{6}\right)\div\left(-\frac{81}{128}\right)\)

\(\Leftrightarrow\frac{320}{243}\)

Tham khảo :https://h.vn/hoi-dap/question/692888.html

Hoặc hỏi trên H.vn 

  \(\left[-\frac{54}{64}--\left(\frac{1}{9}:\frac{8}{27}\right):-\frac{1}{3}\right]:-\frac{81}{128}\)

\(=\left[-\frac{54}{64}+\frac{3}{8}:-\frac{1}{3}\right]:-\frac{81}{128}\)

\(=\left[-\frac{54}{64}-\frac{9}{8}\right]:-\frac{81}{128}\)

\(=-\frac{63}{32}:-\frac{81}{128}\)

\(=\frac{28}{9}\)