\(\dfrac{4}{3.5}+\dfrac{8}{5.9}+\dfrac{12}{9.15}+...+\dfrac{32}{x\left(x+16\right)}=\dfrac{16}{15}\)

\(2.\left(\dfrac{2}{3.5}+\dfrac{4}{5.9}+\dfrac{6}{9.15}+..+\dfrac{16}{X.\left(X+16\right)}\right)=\dfrac{16}{15}\)

\(\dfrac{1}{3}-\dfrac{1}{5}+\dfrac{1}{5}-\dfrac{1}{9}+\dfrac{1}{9}-\dfrac{1}{15}+...+\dfrac{1}{X}-\dfrac{1}{X+16}=\dfrac{8}{15}\)

\(\dfrac{1}{X+16}=\dfrac{1}{3}-\dfrac{8}{15}\)

\(\dfrac{1}{X+16}=\dfrac{-1}{5}\)

\(X+16=-5\)

\(X=-21\)

(x-32):16=48

=> x-32=48.16

=> x-32=768

=> x=768+32

=> x=800

x-32:16=48

=> x-2=48

=> x=48+2

=> x=50

( x - 32 ) : 16 = 48

x - 32             = 48 . 16

x - 32             =  768

x                    =  768 + 32= 800

x - 32 : 16= 48

x -  2 = 48

   x =  48 + 2= 50

dễ thui màk:

( x - 32 ) : 16 = 48

       x - 32    = 48 . 16

       x - 32    = 768

         x        = 768 + 32

         x        = 800

x - 32 : 16 = 48

       x - 2  = 48 

         x     = 48 + 2 

         x     = 50

\(\dfrac{1}{1-x}+\dfrac{1}{1+x}+\dfrac{2}{1+x^2}+\dfrac{4}{1+x^4}+\dfrac{8}{1+x^8}+\dfrac{16}{1+x^{16}}\)

\(=\dfrac{1+x+1-x}{1-x^2}+\dfrac{2}{1+x^2}+\dfrac{4}{1+x^4}+\dfrac{8}{1+x^8}+\dfrac{16}{1+x^{16}}\)

\(=\dfrac{2+2x^2+2-2x^2}{1-x^4}+\dfrac{4}{1+x^4}+\dfrac{8}{1+x^8}+\dfrac{16}{1+x^{16}}\)

\(=\dfrac{4+4x^4+4-4x^4}{1-x^8}+\dfrac{8}{1+x^8}+\dfrac{16}{1+x^{16}}\)

\(=\dfrac{8+8x^8+8-8x^8}{1-x^{16}}+\dfrac{16}{1+x^{16}}\)

\(=\dfrac{16+16x^{16}+16-16x^{16}}{1-x^{32}}=\dfrac{32}{1-x^{32}}\)

58 x 32 + 32 x 8 + 16 x 5

= 32 x ( 58 + 32 ) + 16 x 5

=32 x 90 + 16 x 5

= 16 x 2 x 90 + 16 x 5

= 16 x 180 + 16 x 5

= 16 x ( 180 + 5 )

= 16 x 185

= 2960

\(58.32+32.8+16.5\)

\(=16.116+16.16+16.5\)

\(=16.\left(116+16+5\right)\)

\(=16.137\)

\(=2192\)

58 x 32 + 32 x 8 + 16 x 5

= ( 58 + 8 ) x 32 + 16 x 5

= 66 x 32 + 16 x 5

= 2112 + 80

= 2192

16+16=32=16x2=32

16+16=32=16x2=32

16+16=32=16*2=32

a) 142+(118-x)=217

    118-x         =217-142

    118-x         =75

          x         =43

b) 818-(x-305)=712

          x-305  =818-712

          x-305  = 106

               x   = 411

c)x-32:16=48

   x-2      =48

      x      =50

d)(x-32):16=48

   x-32      =48.16

   x-32      =768

      x        = 800

a ) x = 43
b ) x = 411
c ) x = 50
d ) x = 800
 

a)142+(118-x)=217

118-x          =217-142

118-x          =75

                x=118-75

                x=43

b)818-(x-305)=712

x-305        =818-712

x-305         =106

               x=106+305

               x=411

c)x-32:16=48

x-2      =48

         x=48+2

         x=50

d)(x-32):16=48

x-32       =48:16

x-32       =3

           x=3+32

           x=35

8 x 2 = 16       8 x 4 = 32       8 x 7 = 56       8 x 5 = 40

16 : 8 = 2       32 : 8 = 4       56 : 8 = 7       40 : 8 = 5

16 : 2 = 8       32 : 4 = 8       56 : 7 = 8       40 : 5 = 8

8 x 2 = 16       8 x 4 =32       8 x 7 =56 .     8 x 5 =40 

16 : 8 = 2       32 : 8 =4        56 : 8 =7        40 : 8 =5 

16 : 2 = 8       32 : 4 = 8       56 : 7 = 8       40 : 5 = 8

cái bài này bạn thuộc phép nhân chia của nó là làm dễ lắm nha

\(\frac{2^{4-x}}{16^5}=32^6\)

\(\Rightarrow\frac{2^{4-x}}{\left(2^4\right)^5}=\left(2^5\right)^6\)

\(\Rightarrow\frac{2^{4-x}}{2^{20}}=2^{30}\)

\(\Rightarrow2^{4-x}=2^{30}.2^{20}\)

\(\Rightarrow2^{4-x}=2^{50}\)

\(\Rightarrow4-x=50\)

\(\Rightarrow x=-46\)

\(x\cdot\dfrac{8}{16}=\dfrac{32}{16}\)

\(\Leftrightarrow x=\dfrac{32}{16}:\dfrac{8}{16}\)

\(\Leftrightarrow x=\dfrac{32}{16}\cdot\dfrac{16}{8}\)

\(\Leftrightarrow x=4\)

X=32/16:8/16

=>x=4

Ta có : \(x.\dfrac{8}{16}=\dfrac{32}{16}\)

\(\Leftrightarrow\dfrac{x}{2}=2\)

\(\Leftrightarrow x=4\)

Vậy ..