mình cần gấp sáng mai nộp rồi
\(\left(7x-11\right)^3=2^2\cdot5^2-73\)
\(\Leftrightarrow\left(7x-11\right)^3=27\)
\(\Leftrightarrow7x-11=3\)
\(\Leftrightarrow7x=14\)
\(\Leftrightarrow x=2\)
vậy............
(7x-11)mũ 3=2 mũ 2.5 mũ 2-73
(7x-11)mũ 3=4.25-73
(7x-11)mũ 3=100-73
(7x-11)mũ 3=27
(7x-11)mũ 3=3 mũ 3
7x-11=3
7x=3+11
7x=14
x=14:7
x=2