\(\frac{\left(-5\right)^2.20^4}{8^2.125}=\frac{25.20^4}{8^2.25.5}=\frac{20^4}{8^2.5}=500\)

a,-3/5.2/7+-3/7.3/5+-3/7

=-3/7.2/5+(-3/7).3/5+(-3/7) 

=-3/7(2/5+3/5+1)

=-3/7.2

=-6/7

bn ơi sao lại là 2/5

\(\frac{-3}{5}\)và\(\frac{2}{7}\)mình đổi hai mẫu cho nhau 

\(\dfrac{\left(-5\right)^2.20^2}{8^2.125}=\dfrac{\left[\left(-5\right).20\right]^2}{2^{3^2}.5^3}=\dfrac{\left(-100\right)^2}{\text{4^3}.5^3}=\dfrac{10000}{\left(4.5\right)^3}=\dfrac{10000}{20^3}\dfrac{10000}{8000}=\dfrac{5}{4}\)

2.25.9 + {[ 2.125 - ( 5x + 4 ).5 ] : ( 4.3.5 )]} = 453

= 2.25.9 +  250 - ( 5x + 4 ).5 ] : 12.5  = 453 

= 50.9 + [ 250 - ( 5x + 4 ).5 ] : 60 = 453

= 450 + 250 - ( 5x + 4 ).5  = 453.60

= 450 + 250 - ( 5x + 4 ) = 453 : 5

= 450 + 250 - ( 5x + 4 ) = 90,6

=  450 +  250 - 5x = 90,6 - 4

= 450 + 250 - 5x = 86,6

= 700 - 5x = 86,6

= 86,6 + 700

= 5x = 786,6

= 786,6 : 5

= 157,32

2.25.9 + {[ 2.125 - ( 5x + 4 ).5 ] : ( 4.3.5 )]} = 453

= 2.25.9 +  250 - ( 5x + 4 ).5 ] : 12.5  = 453 

= 50.9 + [ 250 - ( 5x + 4 ).5 ] : 60 = 453

= 450 + 250 - ( 5x + 4 ).5  = 453.60

= 450 + 250 - ( 5x + 4 ) = 453 : 5

= 450 + 250 - ( 5x + 4 ) = 90,6

=  450 +  250 - 5x = 90,6 - 4

= 450 + 250 - 5x = 86,6

= 700 - 5x = 86,6

= 86,6 + 700

= 5x = 786,6

= 786,6 : 5

= 157,32

Answer : 157,32

có

(-5)^2*20^4/862*125

=25*(4*5)^4/64*125

=25*4^4*5^4/64*125

=25*5*4^3*4*5^3/64*125

=125*64*4*5^3/64*125

=4*5^3

=500

thank

\(\frac{\left(-5\right)^2.20^4}{8^2.125}\)

\(=\frac{\left(-5\right)^2.\left(5.2^2\right)^4}{\left(2^3\right)^2.5^3}\)

\(=\frac{\left(-5\right)^2.5^4.2^8}{2^6.5^3}\)

\(=\frac{\left(-5\right)^2.5.2^2}{1.1}\)

\(=\left(-5\right)^2.5.2^2\)

\(=25.5.2=250\)

\(\dfrac{2^7\cdot25^4}{10^8}+\dfrac{-1}{5}+\left(-1.98765\right)^0\)

\(=\dfrac{2^7\cdot5^8}{2^8\cdot5^8}+\dfrac{-1}{5}+1\)

\(=\dfrac{1}{2}-\dfrac{1}{5}+1\)

\(=\dfrac{13}{10}\)

\(=\dfrac{3^{28}\cdot2^{21}\cdot5^{10}}{2^9\cdot3^3\cdot2^2\cdot3\cdot5^{12}}=\dfrac{3^{28}}{3^4}\cdot\dfrac{2^{21}}{2^{11}}\cdot\dfrac{1}{5^2}=\dfrac{3^{24}\cdot2^{10}}{5^2}\)

\(8.25.29.2^2.125=\left(8.25\right).\left(2^2.125\right).29=200.500.29=2900000\)

\(=\left(8.125\right).\left(2^2.25\right).29=1000.100.29=2900000\)