Question

tính bằng cách thuận tiện nhất : 5/9*5/11+5/11*4/9

Answer 1

\(\dfrac{5}{9}\times\dfrac{5}{11}+\dfrac{5}{11}\times\dfrac{4}{9}\)
\(=\left(\dfrac{5}{9}+\dfrac{4}{9}\right)\times\dfrac{5}{11}\)
\(=1\times\dfrac{5}{11}\)
\(=\dfrac{5}{11}\)
#NoSimp

Answer 2

    \(\dfrac{5}{9}\) \(\times\) \(\dfrac{5}{11}\) + \(\dfrac{5}{11}\) \(\times\) \(\dfrac{4}{9}\)

=   \(\dfrac{5}{11}\) \(\times\) ( \(\dfrac{5}{9}\) + \(\dfrac{4}{9}\))

= \(\dfrac{5}{11}\) \(\times\) \(\dfrac{9}{9}\)

= \(\dfrac{5}{11}\)

Answer 3

    5995​ $\times$ 511115​ + 511115​ $\times$ 4994​

=   511115​ $\times$ ( 5995​ + 4994​)

= 511115​ $\times$ 9999​

= 511115​

Answer 4

=5/11x(5/9+4/9)

=5/11x1

=5/11