A =
15 15 15
6 16 16 26 26 36
33 63 93
6 16 16 26 26 36
 
  
 
  

Tính D=\(\frac{\frac{15}{6\times16}+\frac{15}{16\times26}+\frac{15}{26\times36}}{\frac{33}{6\times16}-\frac{63}{16\times26}+\frac{93}{26\times36}}\)

Tính

\(\frac{\frac{15}{6\cdot16}+\frac{15}{16\cdot26}+\frac{15}{26\cdot36}}{\frac{33}{6\cdot16}-\frac{63}{16\cdot26}+\frac{93}{26\cdot36}}\)

A=\(\frac{\frac{15}{6\cdot16}+\frac{15}{16\cdot26}\frac{15}{26\cdot36}}{\frac{33}{6\cdot16}-\frac{63}{16\cdot26}+\frac{93}{26\cdot36}}\)

\(\frac{\frac{15}{6\cdot16}+\frac{15}{16\cdot26}+\frac{15}{26\cdot36}}{\frac{33}{6\cdot16}-\frac{63}{16\cdot26}+\frac{93}{26\cdot36}}\) tính nhẩm

Tính

\(A=\frac{\frac{15}{6\cdot16}+\frac{15}{16\cdot26}+\frac{15}{26\cdot36}}{\frac{33}{6\cdot16}-\frac{63}{16\cdot26}+\frac{93}{26\cdot36}}\)

\(A=\frac{15}{\frac{6\cdot16}{\frac{33}{6\cdot16}}}+\frac{15}{\frac{\frac{16\cdot26}{63}}{16\cdot26}}+\frac{15}{\frac{26\cdot36}{\frac{93}{26\cdot36}}}\) = ?

Tính hợp lý: a) (-37)-14 - 26+37; b)  (-15) - 23+ (-85) -77; c)  (- 24) + 4 + (- 6) + 26; d) 34 + 35 + 36 + 37-14 - 15 - 16 - 17

14+15+16...+26+27+28