\(\frac{5^4.20^4}{25^5.4^5}=\frac{5^4.5^4.4^4}{5^{10}.4^5}=\frac{5^8.4^4}{5^{10}.4^5}=\frac{1}{5^2.4}=\frac{1}{25.4}=\frac{1}{100}\)

\(\frac{5^4.20^4}{25^5.4^5}=\frac{5^4.4^4.5^4}{\left(5^2\right)^5.4^4.4}=\frac{5^4.4^4.5^4}{5^{10}.4^4.4}=\frac{5^4.4^4.5^4}{5^4.5^4.5^2.4^4.4}=\frac{1}{5^2.4}=\frac{1}{100}\)

5⁴ . 20⁴/25⁵ . 45

TL: 

\(\frac{5^4.20^4}{25^5.4^5}=\frac{5^4.5^4.4^4}{(5^2)^5.4^5}=\frac{5^85^4}{5^{10}.4^5}=\frac{1}{25.4}=\frac{1}{100}\)

Sửa đề:

\(\frac{5^4.20^4}{25^5.4^5}\)

\(=\)\(\frac{5^4.5^4.4^4}{\left(5^2\right)^5.4^5}\)

\(=\)\(\frac{5^8.4^4}{5^{10}.4^5}\)

\(=\)\(\frac{1}{25.4}\)

\(=\)\(\frac{1}{100}\)

`1/9(x-3)^2-1/25(x+5)^2=0`

`<=>(1/3x-1)^2-(1/5x+1)^2=0`

`<=>(1/3x-1-1/5x-1)(1/3x-1+1/5x+1)=0`

`<=>(2/15x-2). 8/15x=0`

`<=>2/15x-2=0` hoặc `8/15x=0`

`<=>x=15`         hoặc `x=0`

Vậy `S=`{`15;0`}

a)  \(0,75+\left(\dfrac{-1}{3}\right)-\dfrac{5}{18}=\dfrac{3}{4}+\left(\dfrac{-1}{3}\right)-\dfrac{5}{18}=\dfrac{5}{12}-\dfrac{5}{18}=\dfrac{5}{36}\)

c) \(\dfrac{4}{15}\cdot\dfrac{1}{3}\cdot\dfrac{15}{20}=\dfrac{4}{15}\cdot\dfrac{1}{3}\cdot\dfrac{3}{4}=\dfrac{5}{45}\cdot\dfrac{3}{4}=\dfrac{15}{180}=\dfrac{1}{12}\)

d) \(\left(\dfrac{-1}{9}\right)\cdot\left(\dfrac{15}{22}\right):\left(\dfrac{-25}{9}\right)=\dfrac{-5}{66}:\left(\dfrac{-25}{9}\right)=\dfrac{-5}{66}\cdot\left(\dfrac{9}{-25}\right)=\dfrac{-3}{-110}=\dfrac{3}{110}\)

a) \(0,75\) + \(\dfrac{-1}{3}\) - \(\dfrac{5}{18}\)= \(\dfrac{5}{12}\) - \(\dfrac{5}{18}\) = \(\dfrac{5}{36}\)

b) \(\dfrac{4}{15}\)x \(\dfrac{1}{3}\)x \(\dfrac{15}{20}\)= 4/45 x 15/20 = 1/15

c) -1/9 x 15/22 : -25/9 = -5/66 : -25/9 = 3/110

\(\frac{5^4.20^4}{25^5.4^5}=\frac{5^4.5^4.4^4}{\left(5^2\right)^5.4^5}=\frac{5^8.4^4}{5^{10}.4^5}=\frac{1}{25.4}=\frac{1}{100}\)

minh lam ban

Chọn D

chính xác 100% ko bạn

c: (x-y+4)^2

=x^2+y^2+16+2*x*(-y)-2*y*4+2*x*4

=x^2+y^2+16-2xy-8y+8x

h; x^3y^6z^9-125

\(=\left(xy^2z^3\right)^3-5^3\)

\(=\left(xy^2z^3-5\right)\left(x^2y^4z^6+5xy^2z^3+25\right)\)

|x+5|+17=20

|x+5|=20-17

|x+5|=3

--> x+5=3

    x+5=-3

x= -2

x=-8

nhe duyet di nha olm

/x+5/ -(-17)= 20 <=> /x+5/ =20-17 <=> 2 trường hợp
 trường hợp 1: x+5 = 3 => x =-2
trường hợp 2 : x+5 = -3 => x = -8