Question

rút gọn:

\(\dfrac{6.23-36}{6.22+72}\)              ; \(\dfrac{2.\left(-14\right).22.10}{\left(-11\right).4.\left(-5\right).21}\)

Answer 1

=6.23-6.6/6.22+6.12

=6.(23-6)/6.(22+12)

=6.17/6.34

=6.17/6.2.17

=1/2

 

 

Answer 2

=2.7.(- 2).(- 11).(- 2).(- 5).(- 2)/(- 11).2.2.(- 5).7.3

= 2.(- 2)/7.3

=- 4/21

Answer 3

\(\dfrac{6.23-36}{6.22+72}=\dfrac{6.23-6.6}{6.22+6.12}=\dfrac{6\left(23-6\right)}{6\left(22+12\right)}=\dfrac{1}{2}\)

\(\dfrac{2.\left(-14\right).22.10}{\left(-11\right).4.\left(-5\right).21}=\dfrac{1.\left(-14\right).2.2}{\left(-1\right).2.\left(-1\right).21}=-\dfrac{2}{21}\)

Answer 4

Giải:

\(\dfrac{6.23-36}{6.22+72}=\dfrac{6.23-6.6}{6.22+6.12}=\dfrac{6.\left(23-6\right)}{6.\left(22+12\right)}=\dfrac{\left(23-6\right)}{\left(22+12\right)}=\dfrac{17}{34}=\dfrac{1}{2}\) 

\(\dfrac{2.\left(-14\right).22.10}{\left(-11\right).4.\left(-5\right).21}\) 

\(=\dfrac{2.7.\left(-2\right).\left(-11\right).\left(-2\right).\left(-2\right).\left(-5\right)}{\left(-11\right).4.\left(-5\right).7.3}\) 

\(=\dfrac{2.\left(-2\right).4}{4.3}\) 

\(=\dfrac{2.\left(-2\right)}{3}\) 

\(=\dfrac{-4}{3}\)