đây là tìm x hay tính toán vậy

=\(\frac{2^52^2x3^4}{3^3x2^5}\)=\(\frac{2^23^33}{3^3}\)=4.3=12

\(\frac{2^7\cdot9^2}{3^3\cdot2^5}=\frac{2^7\cdot\left(3^2\right)^2}{3^3\cdot2^5}=\frac{2^7\cdot3^4}{3^3\cdot2^5}=2^2\cdot3=4\cdot3=12\)

Vậy \(\frac{2^7\cdot9^3}{3^3\cdot2^5}=12\)

Ta có:

A = \(\frac{2}{1x3}+\frac{2}{3x5}+\frac{2}{5x7}+\frac{2}{7x9}+\frac{2}{9x11}\)

= \(\frac{1}{1}-\frac{1}{3}+\frac{1}{3}-\frac{1}{5}+\frac{1}{5}-\frac{1}{7}+\frac{1}{7}-\frac{1}{9}+\frac{1}{9}-\frac{1}{11}\)

= \(\frac{1}{1}-\frac{1}{11}\)

=\(\frac{10}{11}\)

TOÁN LỚP 4 HẢ

thực hiện phép tính bằng cách hợp lí (nếu có thể)

a,136:{[(468+332):160-5]+68}+2014

= 136 : { [ ( 468 + 332 ) : 160 - 5 ] + 68 } + 2014

= 136 : { [ 800 : 160 - 5 ] + 68 } + 2014

= 136 : { [ 5 - 5 ] + 68 } + 2014

= 136 : { 0 + 68 } + 2014

= 136 : 68 + 2014

= 2 + 2014

= 2016 

\(136:\left\{\left[\left(468+332\right):160-5\right]+68\right\}+2014\)

\(=136:\left[\left(800:160-5\right)+68\right]+2014\)

\(=136:\left[\left(5-5\right)+68\right]+2014\)

\(=136:\left(0+68\right)+2014\)

\(=136:68+2014=2+2014\)

\(=2016\)

\(136:\left\{\left[\left(468+332\right):160-5\right]+68\right\}+2014\)

\(=136:\left\{\left[800:160-5\right]+68\right\}+2014\)

\(=136:\left\{\left[5-5\right]+68\right\}+2014\)

\(=136:\left\{0+68\right\}+2014\)

\(=136:68+2014\)

\(=2+2014\)

\(=2016\)

b, Ta có : \(\frac{2^7x9^2}{3^3x2^5}=\frac{2^52^2x3^23.3}{3.3^2x2^5}=\frac{2^2x3}{x}=12\)

May tinh la hop li thuan tien nhat nha bn

a) = 4x ( 12 + 1 ) +5

    = 4 x 13 + 5

     =  57

b)= (8x4 + 8x6) +8x 5

  =     8x 10       + 8x5

  =       80          +  40

  = 120 

c) = 2 + 3x2 + 4x2 + 3x2

     = 2 + ( 2 x 10 )

     =  2    + 20 

      =     22

hiểu ý giang ho dai ca roi

bạn quý chết thì có

(1/2-2/3)-(5/3-3/2)+(7/3-5/2)

=1/2-2/3-5/3+3/2+7/3-5/2

=(1/2+3/2-5/2)-(2/3+5/3-7/3)

=-1/2-0=-1/2

\(-\dfrac{2}{5}.\dfrac{4}{7}+\dfrac{-3}{5}.\dfrac{2}{7}+\dfrac{-3}{5}\)

= \(\dfrac{-8}{35}+\dfrac{-6}{35}+\dfrac{-3}{5}\) 

=\(\dfrac{-8-6-21}{35}\) 

=\(\dfrac{-35}{35}\) 

=-1

`(-2)/5.4/7+(-3)/5.2/7+(-3)/5`

`=(-8)/3 +(-6)/35+(-3)/5`

`=(-8)-6-21/35`

`=(-35)/35`

`=(-1)`

`@Nae`

(-2)/5 x 4/7 + (-3)/5 x 2/7 + (-3)/5

`=(-8)/3 +(-6)/35+(-3)/5`

`=(-8)-6-21/35`

`=(-35)/35`

`=(-1)`

`@Nae`

917749738461936926399639748776398646491639394748947630373937366

\(\dfrac{3}{5}\) \(\times\) ( \(\dfrac{5}{2}\) - \(\dfrac{10}{3}\)) - \(\dfrac{5}{8}\): ( \(\dfrac{1}{4}\) - \(\dfrac{2}{3}\))

\(\dfrac{3}{5}\) \(\times\) \(\dfrac{5}{2}\) - \(\dfrac{3}{5}\) \(\times\) \(\dfrac{10}{3}\) - \(\dfrac{5}{8}\): (-\(\dfrac{5}{12}\))

= \(\dfrac{3}{2}\) - 2 + \(\dfrac{3}{2}\)

= (\(\dfrac{3}{2}\) + \(\dfrac{3}{2}\)) - 2

= 3 - 2

= 1

$\frac{3}{5}\times (\frac{5}{2}-\frac{10}{3})-\frac{5}{8}:(\frac{1}{4}-\frac{2}{3})$

$=\frac{3}{5}\times (\frac{15}{6}-\frac{20}{6})-\frac{5}{8}:(\frac{3}{12}-\frac{8}{12})$

$=\frac{3}{5}\times (-\frac{5}{6})-\frac{5}{8}:(-\frac{5}{12})$

$=-\frac{1}{2}-(-\frac{3}{2})$

$=-\frac{1}{2}+\frac{3}{2}$

$=\frac{2}{2}$

$=1$