a, \(\dfrac{x}{3}=\dfrac{8}{12};12:3=4\)\(;8:4=2\)

⇒\(x=\dfrac{2}{3}\)

a: \(\dfrac{x}{3}=\dfrac{8}{12}\)

nên x/3=2/3

hay x=2

b: \(x+\dfrac{1}{15}=\dfrac{1}{3}\)

\(\Leftrightarrow x=\dfrac{1}{3}-\dfrac{1}{15}=\dfrac{5}{15}-\dfrac{1}{15}=\dfrac{4}{15}\)

c: \(x\cdot\dfrac{4}{7}-\dfrac{2}{7}=\dfrac{5}{7}\)

\(\Leftrightarrow x\cdot\dfrac{4}{7}=\dfrac{5}{7}+\dfrac{2}{7}=1\)

hay x=7/4

d: \(\Leftrightarrow x\cdot\dfrac{3}{4}-\dfrac{5}{4}=-\dfrac{1}{2}\)

\(\Leftrightarrow x\cdot\dfrac{3}{4}=-\dfrac{2}{4}+\dfrac{5}{4}=\dfrac{3}{4}\)

hay x=1

5^2 là năm mũ hai ak

\(=3\cdot25-27:9+25\cdot4-18:9=75-3+100-2=72+100-2=170\)

15^3+5.15^2-5^3 / 18^3+6.18^2-6^3

=3375+5.225-125 /5832+6.324-216

=3375+1125-125 /5832+1944-216

=4500-125 /7826-216

=4375 /7610

=875 /1522

mk ko bt viết phần nên viết phần bằng dấu gạch / nhé.mk cx ko bt đúng hay sai đâu nhé

\(15^3+5.15^2-5^3.\frac{1}{8}^3+6.18^2-6^3\)

\(=15^2.\left(15+5\right)-\left(5.\frac{1}{8}\right)^3+6.\left(18^2-6^2\right)\)

\(=225.20-\left(\frac{5}{8}\right)^3+6.\left(324-36\right)\)

\(=4500-\frac{125}{512}+6.288\)

\(=\left(4500+1728\right)-\frac{125}{512}\)

\(=6228-\frac{125}{512}\)

\(=...........\)

26 x 182 + 182 x 47 + 91 x 27 x 2

=26 x 182 + 182 x 47 +(91x2)x27

=26 x 182 + 182 x 47 + 182x27

= 182x(26+47+27)

=    182x100

=18200

26 x 182 + 182 x 47 + 91 x 27 x 2

= 26 x 182 + 182 x 47 +  ( 91 x 2) x 27

= 26 x 182 + 182 x 47 + 182 x 27

= 182 x ( 26 + 47 + 27 )

= 182 x 100

= 18200

=18200

sorry mk chỉ giải đk câu a thui nhé 

(2.5)^2= =100 ; (6.5)^3 =27000 

k cho mk vs dù sao thì mk cũng giúp đk bn mà ^ ^

\(\dfrac{18}{27}-\dfrac{2}{6}=\dfrac{2}{3}-\dfrac{1}{3}=\dfrac{1}{3}\)

\(\dfrac{18}{27}-\dfrac{2}{6}=\dfrac{2}{3}-\dfrac{1}{3}=\dfrac{1}{3}\)

nha bn

= \(\dfrac{1}{3}\)