\(7^{x+2}+2.7^{x-1}=\frac{345}{7}\Leftrightarrow7^{x+3}+2.7^x=345\Leftrightarrow7^x\left(7^3+2\right)=345\)
\(\Rightarrow7^x345=345\Rightarrow7^x=1\Rightarrow x=0\)
Vậy \(x=0\)
\(7^{x+2}+2.7^{x-1}=\frac{345}{7}\Leftrightarrow7^{x+3}+2.7^x=345\Leftrightarrow7^x\left(7^3+2\right)=345\)
\(\Rightarrow7^x345=345\Rightarrow7^x=1\Rightarrow x=0\)
Vậy \(x=0\)
7 mũ x+2+2.7 mũ x-1=345
2.3x+3x-1=7.(32+2.62)
7x+22.7x-1=345
tìm các số nguyên n sao cho
\(\left(\frac{4}{9}\right)^n=\left(\frac{2}{3}\right)^5\)
Tìm X
\(7^{X+2}+2.7^{X-1}=345\)
tính:
\(a.9^x:3^x=3^7\)
b.\(\frac{1}{2}.2^x+2^{x+2}=2^8+2^5\)
c\(^{7^{x+2}+2.7^{x-1}=345}\)
d \(\left(\frac{1}{2}-\frac{1}{3}\right).6^x+6^{x+2}=6^7+6^4\)
Tìm x biết \(7^{x+2}+2.7^{x-1}=345\)
Tìm x
\(7^{x+2}+2.7^{x-1}=345\)
\(\frac{1}{2}2^x+2^{x+2}=2^8+2^5\)
\(2.3^x+3^{x-1}=7\left(3^2+2.6^2\right)\)
Tìm x biết
7x+2+2.7x—1=345
Ai làm nhanh mìn h tích đúng
Tìm x biết:
a) 7x+2 + 2.7x-1= 345
b) 2x+2 - 2x= 96
Cho đề bài
Tìm X
7^x+2+2.7^x-1=345
Ai biết xin giúp dùm