Ta có: \(\left(7x-11\right)^3=2^5+5^2+200=1000\)
\(\Rightarrow\left(7x-11\right)^3=10^3\)
\(\Rightarrow7x-11=10\)
\(\Rightarrow7x=21\)
\(\Rightarrow x=3\)
Trả lời:
\(\left(7x-11\right)^3=2^5.5^2+200\)
\(\Leftrightarrow\left(7x-11\right)^3=32.25+200\)
\(\Leftrightarrow\left(7x-11\right)^3=800+200\)
\(\Leftrightarrow\left(7x-11\right)^3=1000\)
\(\Leftrightarrow7x-11=10\)
\(\Leftrightarrow7x=21\)
\(\Leftrightarrow x=3\)
Vậy\(x=3\)
Hok tốt!
Good girl
\(\left(7\text{x}-11\right)^3=2^5\text{ }.\text{ }5^2+200.\)
\(\left(7\text{x}-11\right)^3=32\text{ }.\text{ }25+200.\)
\(\left(7\text{x}-11\right)^3=800+200.\)
\(\left(7\text{x}-11\right)^3=1000.\)
\(\left(7\text{x}-11\right)^3=10^3.\)
\(\Rightarrow\text{ }\text{7x}-11=10.\)
\(\text{7x}=10+11\)
\(\text{7x}=21\)
\(x=21\div7\)
\(x=3\)
Vậy \(x=3\)
b) (7x-11)3=25 x 52+200
(7x-11)3=32 x 25+200
(7x-11)3=800+200
(7x-11)3=1000
(7x-11)3=103
7x-11 =10
7x =10+11
7x =21
x =21:7
x = 3
