136 x 68 + 16 x 272

= 136 x 68 + 16 x  2 x 136

= 136 x 68 + 32 x 136

= 136 x ( 68 + 32 )

= 136 x 100

= 13600    

136x68+16x272

=9248 + 4352

=13600

\(\frac{7}{12}-0,75:\left(4x-3\right)^2=\frac{-3}{2}\)

\(\frac{3}{4}:\left(4x-3\right)^2=\frac{25}{12}\)

\(\left(4x-3\right)^2=\frac{9}{25}=\left(\frac{\pm3}{5}\right)^2\)

+) 4x - 3 = 3/5

4x = 18/5

x = 9/10

+) 4x - 3 = -3/5

4x = 12/5

x = 3/5

Vậy,.........

\(\frac{7}{12}-0,75:\left(4x-3\right)^2=-\frac{3}{2}\)

\(\Leftrightarrow\frac{7}{12}.12\left(4x-3\right)^2-\frac{0,75}{\left(4x-3\right)^2}.12\left(4x-3\right)^2=-\frac{3}{2}.12\left(4x-3\right)^2\)

\(\Leftrightarrow7\left(4x-3\right)^2-9=-18\left(4x-3\right)^2\)

\(\Rightarrow\orbr{\begin{cases}x=\frac{9}{10}\\x=\frac{3}{5}\end{cases}}\)

a) 35 x 34 + 35 x 38 + 65 x 75 + 65 x 45

  = 35 x (34+38)  + 65 x (75 + 45)

  = 35 x 72   +    65 x 120

  =  2520 + 7800 = 10320

b)  3 x 25 x 8 + 4 x 37 x 6 + 2 x 38 x 12

 = 3 x ( 25 x 8) + 4 x (37 x 6) + 2 x (38 x 12)

 = 3 x 200 + 4 x 222 + 2 x 456

= 600 + 888 + 912 = 2400

tk nha

35 x 34 + 35 x 38 + 65 x 75 + 65 x 45 

= 35 x ( 34 + 38 ) + 65 x ( 45 + 75 )

= 35 x 72 + 65 x 120

x+12=45

x=45-12

x=33

x+12=45

x      =45-12

x       =33

-12(x-5) + 7(3-x) = 5

-12x + 60 + 21 - 7x = 5

-12x + (-7x)            = 5 + (-21) + (-60)

           -19x            =      -76

             19x           = 76

                x           = 76 : 19

                x           = 4

k mk nha bn

ko ghi lại đề nha 

a ) x - 2 = 12 

    x       = 14 

b ) 5x + x = 39-3¹¹ : 3⁹

          6x  = 39 - 3²

           6x = 39 - 9

              6x= 30

             x   = 5 

c ) 3^x = 9 

     ^{x     = 2}   ( vì 3² = 9 ) 

^{d ) 4x = 64} 

       ^{x = 64/4 = 16} 

^{e )} 2^x = 16 

^{x       = 4 (} vì 2⁴ = 16 )

^{f )} 9^x-1 = 9 

^{x - 1      = 1 (} vì 9¹ = 9 ) 

^{x            =  2}

^{g )} x⁴ = 16

 ^{x        = 2} 

^{h )} 2^x : 2⁵ = 1 

   2^x-5 = 1 

^{x - 5     = 0 (} vì bất cứ số nào luỹ thừa 0 cũng bằng 1 ) 

^{x          = 5}   

5 x 1 = 5

5 x 2 = 10

8 x 8 = 64

100 x 100 = 1000

57 : 3 = 19

12 : 6 = 2

trả lời

=5

=10

=64

=10000

=19

=2

hok tốt

////////////

2 x (13 x 12) - 3 x (96 : 4)

= 2 x 156 - 3 x 24

= 2 x 6,5 x 24 - 3 x 24

= 13 x 24 - 3 x 24

= (13 - 3) x 24

= 10 x 24

= 240

mik nhah nhất nha

2 x(13 x 12) - 3 x ( 96:4) =240

( 5/4x - 2/3 )^4 = 57/16 + 3/2

=> ( 5/4x - 2/3 )^4 = 81/16

=> ( 5/4x - 2/3 )^4 = 3^4/2^4

=> 5/4x - 2/3 = 3/2

=> 5/3x = 13/6

=> x = 13/10

      Vậy x = 13/10

\(\left(\frac{5}{4}x-\frac{2}{3}\right)^4-\frac{3}{2}=\frac{57}{16}\)

\(\left(\frac{5}{4}x-\frac{2}{3}\right)^4-\frac{3}{2}=\frac{57}{16}+\frac{3}{2}\)

\(\left(\frac{5}{4}x-\frac{2}{3}\right)=\frac{81}{16}\)

Ta xét 2th:

Th1: \(\frac{5}{4}x-\frac{2}{3}=\left(\frac{81}{16}\right)^{\frac{1}{4}}\)

\(\Rightarrow x=\frac{26}{15}\)

Th2: \(\frac{5}{4}x-\frac{2}{3}=-\left(\frac{81}{16}\right)^{\frac{1}{4}}\)

\(\Rightarrow x=-\frac{2}{3}\)

\(\Rightarrow\orbr{\begin{cases}x=\frac{26}{15}\\x=-\frac{2}{3}\end{cases}}\)