Bằng \(\frac{1708}{625}\)

= 1708/625

k mình nha

\(A=\frac{2^{10}.13+2^{10}.65}{2^8.104}=\frac{2^{10}.\left(13+65\right)}{2^8.104}=\frac{2^{10}.78}{2^8.104}=3\)

\(A=\frac{2^{10}.13+2^{10}.65}{2^8.104}=\frac{2^{10}\left(13+65\right)}{2^8.104}=\frac{2^{10}.78}{2^8.104}=\frac{2^2.78}{104}=\frac{2^2.2.39}{2^3.13}=\frac{2^3.39}{2^3.13}=3\)

( 17x - 25 ) : 8 + 65 = 9^2

( 17x - 25 ) : 8 + 65 = 81

( 17x - 25 ) : 8        = 81 - 65

( 17x - 25 ) : 8        = 16

( 17x - 25 )             = 16 x 8

( 17x - 25 )             = 128

  17x                     = 128 + 25

   17x                    = 153

      x                     = 153 : 17

      x                     = 9

\(\left(17x-25\right):8+65=9^2\)

\(\Leftrightarrow\left(17x-25\right):8=81-65\)

\(\Leftrightarrow\left(17x-25\right):8=16\)

\(\Leftrightarrow17x-25=16.8\Leftrightarrow17x=128+25\Leftrightarrow17x=153\Leftrightarrow x=153:17=9\)

(k cho mình với nhá!)

a (-4) . (+3) . (-125) . (+25) . (-8)

=[(-4) . (+25)] . [(-125) . (-8)] . (+3)

=(-100) + (1000) . (+3)

= -300 000

b (-67) . (1 - 301) - 301 . 67

=(-67) . 1 + 67 . 301 - 67 . 301

= - 67

a) 1152-(374+1152)+(-65+374)

=1152-374-1152-65+374

=(1152-1152)+(-374+374)-65

=-65

a, 1152 - ( 374 + 1152 ) + ( -65 + 374 )

= 1152 - 374 - 1152 - 65 + 374 

= ( 1152 - 1152 ) - ( 374 - 374 ) - 65

= 0 - 0 - 65

= -65

b, 13 - 12 + 10 - 9 + 8 - 7 - 6 + 5 - 4 + 3 + 2 - 1

= ( 13 - 12 ) + 11 + ( 10 - 9 ) + ( 8 - 7 ) - ( 6 - 5 ) - ( 4 - 3 ) + ( 2 - 1 )

= 1 + 11 + 1 + 1 - 1 - 1 + 1

= 13

a, \(\frac{65}{91}+\frac{-33}{55}=\frac{5}{7}+\frac{-3}{5}=\frac{4}{35}\)

b, \(\frac{36}{-84}+\frac{100}{450}=\frac{-3}{7}+\frac{2}{9}=-\frac{13}{63}\)

c, \(\frac{-650}{1430}+\frac{588}{686}=\frac{-5}{11}+\frac{6}{7}=\frac{31}{77}\)

d, \(\frac{2004}{2010}+\frac{8}{-670}=\frac{334}{335}+\frac{-4}{335}=\frac{66}{67}\)

thank you

\(b,1.2.3...9-1.2.3...8-1.2.3...7.8^2\)

\(=(1.2.3...8).(9-1-8)\)

\(=(1.2.3...8).0\)

\(=0\)

a,

= (1 + 3 - 5 - 7) + (9 + 11 - 13 - 15) + ... + (393 + 395 - 397 - 399)

= (-8) + (-8) + ... + (-8)

= (-8) . 50 (vì có 50 lần số hạng -8)

= - 400

_Vậy