520 : (515.6 + 515.19)
= 520 : [515(6 + 9)]
= 520 : (515.15)
= \(\frac{625}{3}\)
\(5^{20}:\left(5^{15}.6+5^{15}.19\right)=5^{20}:\left[5^{15}\left(6+19\right)\right]\)
\(=5^{20}:\left(5^{15}.25\right)=5^{20}:\left(5^{15}.5^2\right)=5^{20}:5^{17}\)
\(=5^3=125\)
Bài làm
520 : ( 515 . 6 + 515 . 19 )
= 520 : [ 515 . ( 6 + 19 ) ]
= 520 : [ 515 . 25 ]
= 520 : [ 515 . 52 ]
= 520 : 515
= 55
= 3125
# Học tốt #
\(5^{20}:\left(5^{15}\cdot6+5^{15}\cdot19\right)\)
\(=5^{20}:\left[5^{15}\cdot\left(6+19\right)\right]\)
\(=5^{20}:\left[5^{15}\cdot25\right]\)
\(=5^{20}:\left[5^{15}\cdot5^2\right]\)
\(=5^{20}:5^{17}\)
\(=5^3\)
\(=125\)
Á chết sai sai rồi mình nhầm 19 thành 9
520 : (515.6 + 515.19)
= 520 : [515.(6 + 19)]
= 520 : (515 . 52)
= 520 : 517
= 53
Bài làm
520 : ( 515. 6 + 515 . 19)
= 520 : [ 515 . ( 6 + 19 ) ]
= 520 : [ 515 . 52 ]
= 520 : 517
= 53
= 125
# Học tốt #
520:(515.6+515.19)
= 520:(515+(19+6)
=520:(515+25)
=520:(515+52)
=520:517
=53=125
=125
hok tốt
