Question

[kudo shinichi]

tìm x

a) 5/8 - x = 2 1/6

b) 4/9 : x = -1/3+1 1/6

c) (3x-2)^3 = -1 / 27

d)/3x-4/ = 16 1/9 + 18/19

e) /2x + 1/=x+2

Answer 1

[Arima Kousei]

\(a)\frac{5}{8}-x=2\frac{1}{6}\)

\(\Rightarrow\frac{5}{8}-x=\frac{13}{6}\)

\(\Rightarrow x=\frac{5}{8}-\frac{13}{6}\)

\(\Rightarrow x=\frac{15}{24}-\frac{52}{24}\)

\(\Rightarrow x=-\frac{37}{24}\)

\(b)\) \(\frac{4}{9}:x=-\frac{1}{3}+1\frac{1}{6}\)

\(\Rightarrow\frac{4}{9}:x=-\frac{1}{3}+\frac{7}{6}\)

\(\Rightarrow\frac{4}{9}:x=-\frac{2}{6}+\frac{7}{6}\)

\(\Rightarrow\frac{4}{9}:x=\frac{5}{6}\)

\(\Rightarrow x=\frac{4}{9}:\frac{5}{6}\)

\(\Rightarrow x=\frac{4}{9}.\frac{6}{5}\)

\(\Rightarrow x=\frac{8}{15}\)

\(c)\left(3x-2\right)^3=-\frac{1}{27}\)

\(\Rightarrow3x-2=-\frac{1}{3}\)

\(\Rightarrow3x=-\frac{1}{3}+2\)

\(\Rightarrow3x=-\frac{1}{3}+\frac{6}{3}\)

\(\Rightarrow3x=\frac{5}{3}\)

\(\Rightarrow x=\frac{5}{3}:3\)

\(\Rightarrow x=\frac{5}{9}\)

d ) và e ) tự làm 

Chúc bạn học tốt !!! 

Answer 2

[Cô Nàng Bảo Bình]

5/8-x=21/6 x=5/8-21/6 x=-23/8 Vậy x=-23/8 b, 4/9:x=-1/3+11/6 4/9:x= 3/2 x= 4/9:3/2