Question

Tính nhanh :

A = 7/18:5/13-2/18*13/5

Answer 1

A = \(\frac{7}{18}\) :  \(\frac{5}{13}\) -  \(\frac{2}{18}\)x \(\frac{13}{5}\)

A =      \(\frac{91}{90}\)         -        \(\frac{13}{45}\)

A =                  \(\frac{13}{18}\)

Answer 2

A=\(\frac{7}{18}\):\(\frac{5}{13}-\frac{2}{18}x\frac{13}{5}\)

A=\(\frac{7}{18}x\frac{13}{5}-\frac{2}{18}x\frac{13}{5}\)

A=\(\frac{13}{5}x\left(\frac{7}{18}-\frac{2}{18}\right)\)

A=\(\frac{13}{5}x\frac{5}{18}\)

A=\(\frac{13}{18}\)

k mink nhé

Answer 3

7/18 : 5/13 - 2/18 . 13/5 = 7/18 . 3/5 - 2/18 . 13/5
                                   = 13/5 . (7/18 - 2/18 ) 
                                   =13/5. 5/18 = 13/18