\(\dfrac{-1}{13}\)

\(\dfrac{3}{5}\)

\(\dfrac{1}{6}\)

a: =-1/13

b: =1/6

c: =-3/5

-1/13

1/6

-3/5

a) -1/13

b) 1/6

c) -3/5

\(\dfrac{-270}{450}=\dfrac{-9}{15}\)
\(\dfrac{11}{-143}=\dfrac{1}{-13}\)
\(\dfrac{32}{12}=\dfrac{8}{3}\)
\(\dfrac{-26}{-156}=\dfrac{1}{6}\)

Bài 1:

a. -16/64 = -16:16/ 64:16= -1/4

b. 26/-65=-26/65= -26:13/65:13=-2/5

c. -270/-450=270/450= 270:90/450:90=3/5

Bài 2:

Không có đề bài làm làm sao được?

270*270=.72900...

450 : 4500=0,1

^^

ai nhanh nhất mình k!

270 * 270 = 72 900

450 : 4500 = 0,1

bạn nhé

\(\frac{270}{450}=\frac{270:90}{450:90}=\frac{3}{5}\)

\(\frac{26}{156}=\frac{26:26}{156:26}=\frac{1}{6}\)

\(\frac{123123}{237237}=\frac{123123:3003}{237237:3003}=\frac{41}{79}\)

a) \(\frac{270}{-450}+\frac{4545}{5454}=-\frac{3}{5}+\frac{5}{6}=\frac{7}{30}\)

b) \(\frac{-33}{429}+\frac{-156}{-26}+\frac{224}{-84}=\frac{-1}{13}+6+\frac{-56}{21}=\frac{127}{39}\)

c) \(\frac{405}{-567}+\frac{-161}{552}+\frac{162}{-243}=-\frac{5}{7}+\frac{-7}{24}+\frac{-2}{3}=\frac{-281}{168}\)

d) \(-\frac{2}{3}\left(\frac{2}{18}+\frac{-6}{12}-\frac{3}{33}\right)=-\frac{2}{3}\left(\frac{1}{9}+\frac{-1}{2}-\frac{1}{11}\right)\)

\(=-\frac{2}{3}.\left(-\frac{95}{198}\right)=\frac{95}{297}\)

270+6[x-15]=450 

        6[x-15]=450-270

        6[x-15]=180

         x-15=180:6

         x-15=30

         x=30+15

         x=45

\(270+6.\left(x-15\right)=450\)

\(\Leftrightarrow6.\left(x-15\right)=180\)

\(\Leftrightarrow x-15=30\)

\(\Leftrightarrow x=45\)

Vậy \(x=45\)

270 + 6 [ x - 15 ] = 450

         6 [ x - 15 ] = 450 - 270

         6 [ x - 15 ] =  180

            x - 15     = 180 : 6

            x - 15     = 30

            x = 30 + 15

            x = 45 

Vậy , x = 45