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

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

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

-270/450 = -3/5

-26/-156 = 1/6

3.21/ 14.15 = 3/10

-270/450=-3/5

-26/-156=1/6

3.21/14.15=(3.7.2^2)/(2*7*5*3)=2/5

\(\frac{-270}{450}\)= -0,6

\(\frac{-26}{-156}\)= 0,1666...

\(\frac{3,21}{14,15}\)= 0,2268...

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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

-270/450 (chia cho 10)= - 27/45(chia cho 9) = - 3/5

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

=\(\frac{3}{5}\)

\(270/450=3/5\)

a: =-1/13

b: =1/6

c: =-3/5

-1/13

1/6

-3/5

a) -1/13

b) 1/6

c) -3/5

\(\frac{270.450+135.505.2}{2+4+6+...+16+18}\)

\(=\frac{270.450+135.2.505}{2.\left(1+2+3+...+8+9\right)}\)

\(=\frac{270.450+270.505}{2.\left(1+9\right).9:2}\)

\(=\frac{270.\left(450+505\right)}{10.9}=\frac{270.955}{90}=3.955=2865\)

0.18518518518 hoặc 5/27

\(\dfrac{9}{270}+\dfrac{25}{135}-\dfrac{3}{90}\)

\(=\dfrac{1}{30}+\dfrac{5}{27}-\dfrac{1}{30}\)

\(=\dfrac{5}{27}\)