a, \(3^{-2}.3^4.3^x=3^7\)

\(\Rightarrow3^{-2+4+x}=3^7\)

\(\Rightarrow3^{2+x}=3^7\)

Vì \(3\ne\pm1;3\ne0\) nên \(2+x=7\Rightarrow x=5\)

b, \(2^{-1}.2^x+4.2^x=9.2^5\)

\(\Rightarrow2^x\left(2^{-1}+4\right)=288\)

\(\Rightarrow2^x.4,5=288\Rightarrow2^x=64=2^6\)

Vì \(2\ne\pm1;2\ne0\) nên \(x=6\)

Chúc bạn học tốt!!!

a)

4,3. x + (-1,3). x + 1,6=8,2

[4,3 + (-1,3)].x = 8,2 - 1,6

3. x = 6,6

x = 6,6:3

x = 2,2

Vậy x = 2,2.

b) -5,6. x + 16,2 = 3,4. x

-5,6. x + 16,2 = 0 + 3,4. x

-5,6. x - 3,4. x = 0 - 16,2

(-5,6 - 3,4). x = -16,2

-9. x = -16,2

x = -16,2 : -9

x = 1,8

Vậy x = 1,8.

\(\Rightarrow P=\frac{3^{11}\left(5+4.3\right)}{3^9\left(5^2-2^3\right)}\)

\(\Rightarrow P=\frac{3^2.17}{17}=3^2=9\)

P= 3¹¹(5+12) / 3⁹(25-8) 

P= 9.17 / 17

P= 9

a, \(\left(\frac{1}{2}-\frac{1}{3}\right)\cdot6^x+6^{x+2}=6^{10}+6^7\)

\(\Leftrightarrow\frac{1}{6}\cdot6^x+6^x\cdot6^2=6^{10}+6^7\)

\(\Leftrightarrow6^{x-1}\left(1+6^3\right)=6^7\left(6^3+1\right)\)

\(\Leftrightarrow6^{x-1}=6^7\Leftrightarrow x-1=7\)

\(\Leftrightarrow x=8\)

b, \(\left(\frac{1}{2}-\frac{1}{6}\right)\cdot3^{x+4}-4\cdot3^x=3^{16}-4\cdot3^{13}\)

\(\Leftrightarrow\frac{1}{3}\cdot3^{x+4}-4\cdot3^x=3^{13}\left(3^3-4\right)\)

\(\Leftrightarrow3^x\cdot3^3-4\cdot3^x=3^{13}\left(3^3-4\right)\)

\(\Leftrightarrow3^x\left(3^3-4\right)=3^{13}\left(3^3-4\right)\)

\(\Leftrightarrow3^x=3^{13}\Leftrightarrow x=13\)

a. x=8

b. x=13

còn cách tính thì mình quên rồi vì minh học cái này lâu lắm rồi ko nhớ đc.

a)\(\left(\frac{1}{2}-\frac{1}{3}\right).6^x+6^{x+2}=6^{15}+6^{18}\)

\(\frac{1}{6}.6^x+6^{x+2}=6^{15}\left(1+6^3\right)\)

\(\frac{1}{6}.6^x\left(1+6^3\right)=6^{15}.217\)

\(6^{x-1}.217=6^{15}.217\)

\(6^{x-1}=6^{15}\)

\(x-1=15\)

\(x=16\)

b) \(\left(\frac{1}{2}-\frac{1}{6}\right).3^{x+4}-4.3^x=3^{16}-4.3^{13}\)

\(\frac{1}{3}.3^x.4\left(3^4-1\right)=3^{13}.4\left(3^3-1\right)\)

\(3^x.4.\left(3^3-1\right)=3^{13}.4.\left(3^3-1\right)\)

\(3^x=3^{13}\)

\(x=13\)

\(\left(\frac{1}{2}-\frac{1}{6}\right).\left(3^x.3^4\right)-4.3^x=3^{16}-4.3^{13}\)

=> \(\frac{1}{3}.3^x.3^4-4.3^x=3^{16}-4.3^{13}\)

=> \(3^x.3^4-4.3^x=\left(3^{16}-4.3^{13}\right):\frac{1}{3}\)

=> \(3^x.3^4-4.3^x=-386339074,3\)

=> \(3^x.\left(3^4-4\right)=-386339074,3\)

=> \(3^x.77=-386339074,3\)

=> \(3^x=-386339074,3:77\)

=> \(3^x=-5017390,575\)

=> x = ... chắc tự ngồi tính đc

cái a tương tự thôi

\(5^{x+4}-3.5^{x+3}=2.5^{11}\)

\(5^{x+3}\left(5-3\right)=2.5^{11}\)

\(5^{x+3}.2=2.5^{11}\)

\(5^{x+3}=5^{11}\)

\(x+3=11\)

\(x=8\)

\(4^{x+3}-3.4^{x+1}=13.4^{11}\)

\(4^{x+1}\left(4^2-3\right)=13.4^{11}\)

\(4^{x+1}.13=13.4^{11}\)

\(4^{x+1}=4^{11}\)

\(x+1=11\)

\(x=10\)

phân số thứ nhất =16/11

phân số thứ hai = -5/9

phân số thứ ba = 10/77

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