`(20.2^4+12.2^4-48.2^2):8^2`

`=(32.2^4-12.2^4):8^2`

`=[2^4.(32-12)]:8^2`

`=20.2^4:8^2`

`=20.16:64`

`=5`

Ta có: \(\left(20\cdot2^4+12\cdot2^4-48\cdot2^2\right):8^2\)

\(=\left(32\cdot2^4-12\cdot2^4\right):2^6\)

\(=20\cdot\dfrac{2^4}{2^6}\)

=5

a. \(\left(20.2^4+12.2^4-48.2^2\right):8^2\)

= \(\left[2^4.\left(20+12\right)-48.4\right]:64\)

= \(\left[16.32-192\right]:64\)

= \(\left[512-192\right]:64\)

= \(320:64\)

= \(5\)

b. \(\left(75.5^2+175.54\right):\left(20.125-625.75\right)\)

= \(\left(75.25+175.54\right):\left(20.125-625.75\right)\)

= \(\left(1875+9450\right):\left(2500-46875\right)\)

= \(11325:\left(-44375\right)\)

= \(\dfrac{-453}{1775}\)

c. \(\left[6.64.8^2:\left(4^3-2^5.16\right)\right]\)

= \(\left[6.64.64:\left(64-32.16\right)\right]\)

= \(\left[24576:\left(64-512\right)\right]\)

= \(\left[24576:\left(-448\right)\right]\)

= \(\dfrac{-387}{7}\)

(75.54+175.54):(20.25.125-625.75)

=(4050+9450):(62500-46875)

=13500:15625

0,864 like nếu thích nha

like nha

a: \(78\cdot82=80^2-4=6400-4=6396\)

b: \(45^2+90\cdot55+55^2=100^2=10000\)

(-5)^2-(5x-3)=43

   25 -  ( 5x - -3 ) = 43

           5x -3   =  25 - 43 

           5x -3   =  - 18

           5x     =  - 18  + 3

           5x   =    -15 

           x =   -15 : 5

               x = -3 

Hok tốt

\(\left(-5\right)^2-\left(5x-3\right)=43\)

\(\Rightarrow25-5x+3=43\)

\(\Rightarrow28-5x=43\)

\(\Rightarrow5x=28-43=-15\)

\(\Rightarrow x=-3\)

Vậy x = -3

hết chiện để hỏi à

Đề sai nha sửa:1 - 3 + 5 - 7 +...+ 97 - 99

Đặt A=1- 3 + 5 - 7 +...+ 97 - 99 

                 Có (99-1):2+1=50 số hạng

A=(1-3)+(5-7)+......................+(97-99)

           Có 50:2=25 nhóm

A=(-2)+(-2)+....................+(-2)

           Có 25 số hạng

A=(-2).25=-50

Chúc bn học tốt

ko sai ok

đề là -1