\(7^{2x}+7^{2x+2}=2450\)
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Tìm x
7^2x+7^2x+2=2450
\(7^{2x}+7^{2x+2}=2450\)
\(\Rightarrow7^{2x}\left(1+7^2\right)=2450\)
\(\Rightarrow7^{2x}\cdot50=2450\)
\(\Rightarrow7^{2x}=49=7^2\)
\(\Rightarrow2x=2\Rightarrow x=1\)
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72x+72x+2=2450
72x(1+72)=2450
72x.50=2450
72x=2450 : 50 = 49 = 72
=> 2x=2 => x=1
Vậy x=1
72x(1+72)=2450
72x.(1+49)=2450
72x.50=2450
72x =2450:50
72x =49
72x =72
72 =72
=>x=1
\(7^{2x}+7^{2x+2}=2450\)
72x+72x+2=2450
72x+72x.72=2450
72x.(1+72)=2450
72x.50=2450
72x =2450:50
72x =49
72x =72.1
=>x=1
Chuc bn hoc tot
72x +72x+2=2450
72x+72x+2=2450
=>72x(1+72)=2450
=>72x.50=2450
=>72x=2450/50
=>72x =49=72
=>2x=2
=>x=1
Vậy x=1
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72x +72x+2=72 + 74
2x+2x+2=2+4
4x=4
x=1
k cho mk nha!!!
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Xem thêm câu trả lời
Tìm x
72x+72x+2=2450
72x(1+ 49) = 2450
72x = 2450/50 = 49 = 72
2x = 2
x = 1
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72x + 72x+2= 2450
1.72x + 72x+72=2450
72x.(1+72)=2450
72x.(1+49)=2450
72x.50 = 2450
72x=2450:50
72x=49
49=72
2x=2
x=2:2
x=1
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Tìm x:
72x+72x+2=2450
\(7^{2x}+7^{2x+2}=2450\)
\(\Rightarrow7^{2x}+7^{2x}\times7^2=2450\)
\(\Rightarrow7^{2x}\times\left(1+7^2\right)=2450\)
\(\Rightarrow7^{2x}\times50=2450\)
\(\Rightarrow7^{2x}=49\)
\(\Rightarrow7^{2x}=7^2\)
\(\Rightarrow2x=2\)
\(\Rightarrow x=2:2\)
\(\Rightarrow x=1\)
Vậy x = 1
_Chúc bạn học tốt_
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Tìm x biết:
\(7^{2x}+7^{2x+2}=2450\)
\(7^{2x}+7^{2x+2}=2450\)
\(7^{2x}\left(1+7^2\right)=2450\)
\(7^{2x}=2450\div50\)
\(7^{2x}=49\)
\(\Rightarrow2x=2\)
\(\Leftrightarrow x=1\)
\(7^{2x}+7^{2x+2}=2450\)
\(\Leftrightarrow7^{2x}+7^{2x}.7^2=2450\)
\(\Leftrightarrow7^{2x}\left(1+7^2\right)=2450\)
\(\Leftrightarrow49^x\left(1+49\right)=2450\)
\(\Leftrightarrow49^x.50=2450\)
\(\Leftrightarrow49^x=2450:50\)
\(\Leftrightarrow49^x=49\)
\(\Rightarrow x=1\)
vậy x=1
\(7^{2x}+7^{2x+2}=2450\)
TÌM X
\(7^{2x}+7^{2x+2}=2450\)
Tìm x
72x + 72x+2 = 2450
1.72x + 72x.72 = 2450
72x.(1+72) = 2450
72x.(1+49) = 2450
72x.50 = 2450
72x = 2450 : 50
72x = 49
72x = 72
2x = 2
x = ... (Tự tính)
Vậy x = ...
\(7^{2x}+7^{2x+2}=2450\)
\(1\times7^{2x}+7^{2x}\times7^2=2450\)
\(7^{2x}\left(1+7^2\right)=2450\)
\(\frac{7^{2x}\left(1+7^2\right)}{1+7^2}=\frac{2450}{1+7^2}\)
\(7^{2x}=\frac{2450}{1+49}\)
\(7^{2x}=\frac{2450}{50}\)
\(7^{2x}=49\)
\(7^{2x}=7^2\)
\(2x=2\)
\(x=2\div2\)
\(x=1\)
Học tốt nha.