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a. 37-7.(x+1)=40-8.3
37 - 7(x+1) = 16
7(x+1) = 21
x+1 = 3
x=2
b. (x+5).3=11=10+(3+4).4
(sao có 2 dấu bằng, dấu nào là dấu cộng do viết nhầm ???)
c. 25-5.3+4.10=100-5.x
50 = 100 - 5x
5x = 50
x=10
d. 36+2.(x-7)=12+8.(3+5)-36
36 + 2(x-7) = 40
2(x-7) = 4
x-7 =2
x=9
e. 3.(x+7)-9=11.5-5-8
3(x+7) - 9 = 42
3(x+7) = 51
x+7 = 17
x=10
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\(5^1+2x\div5=625\)
\(\Leftrightarrow2x\div5=620\)
\(\Leftrightarrow x=1550\)
P/s tham khảo nha
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a) \(5^x=625\)\(=>x=4\)vì \(\left(\sqrt[4]{625}=5\right)\)
b) \(2^x=32\)\(=>x=5\)vì \(\left(\sqrt[5]{32}=2\right)\)
c) \(x^{50}=x\)\(=>x=1\)vì với 1 có số mũ rất lớn thì nó cũng = chính nó
d) \(\left(x-2\right).\left(x-1\right)=0\) \(=>\orbr{\begin{cases}\left(x-2\right)=0\\\left(x-1\right)=0\end{cases}}=>\orbr{\begin{cases}x=2\\x=1\end{cases}}\)
vậy \(x=2\)HOẶC \(x=1\)
\(a.5^x=625\)
\(\Leftrightarrow5^x=5^4\)
\(\Leftrightarrow x=4\)
\(b.2^x=32\)
\(\Leftrightarrow2^x=2^5\)
\(\Leftrightarrow x=5\)
\(c.x^{50}=x\)
\(\Leftrightarrow x^{50}-x=0\)
\(\Leftrightarrow x\left(x^{49}-1\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x=0\\x^{49}-1=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=0\\x^{49}=1\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=0\\x=1\end{cases}}}\)
\(d.\left(x-2\right)\left(x-1\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x-2=0\\x-1=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=2\\x=1\end{cases}}}\)
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a) 25+x=0
x=0-25
x=-25
b)\(2^x:2^{19}=2^{25}\)
\(2^x=2^{25}.2^{19}\)
\(2^x=2^{44}\)
=>x=44
c)\(5^x.5^{18}=5^{54}\)
\(5^x=5^{54}:5^{18}\)
\(5^x=5^{36}\)
=>x=36
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\(5^x=25\) \(\left(3+x\right)=8\) \(\left(x+1\right)=64\)
Vì 5 x 5 = 25 \(3+x=8\) \(x+1=64\)
\(\Rightarrow x=2\) \(x=8-3\) \(x=64-1\)
\(x=5\) \(x=63\)
\(5^x=25\)
\(\Rightarrow5^x=5^2\)
\(\Rightarrow5^2=5^2\)
\(\Rightarrow x\)\(=2\)
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a) 10 chia hết cho ( x - 5 )
=> ( x - 5 ) thuộc Ư(10) = {1;2;5;10}
=> x thuộc {6;7;10;15}
b) 40 - ( x - 3 ) = 6
=> x - 3 = 34
=> x = 37
a. \(25:\left(x+1\right)=5\\ \Leftrightarrow x+1=25:5=5\\ \Rightarrow x=4\inℕ\\ \)
b.
\(\left(40+x\right)5=625\\ \Leftrightarrow40+x=625:5=125\\ \Rightarrow x=125-40\Rightarrow x=85\inℕ\)
Đs.....