Question

2 . 3^x  = 10 . 3¹² + 8 . 27⁴

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Answer 1

\(2.3^x=10.3^{12}+8.27^4\)

=>\(2.3^x=10.3^{12}+8.\left(3^3\right)^4\)

=>\(2.3^x=10.3^{12}+8.3^{12}\)

=>\(2.3^x=3^{12}.\left(10+8\right)\)

=>\(2.3^x=3^{12}.18\)

=>\(2.3^x=3^{12}.3^2.2\)

=>\(2.3^x=3^{14}.2\)

=>\(3^x=3^{14}\)

=>x=14

Answer 2

\(\Rightarrow2.x^3=9565938\)

\(\Rightarrow x^3=9565938:2=4782969\)

\(\Rightarrow x=168.49....\)

Answer 3

2.3^x=10.3¹²+8.27⁴

2.3^x=10.3¹²+8.3¹²

2.3^x=3¹².(10+8)

2.3^x=3¹².18

2.3^x=3¹².3².2

2.3^x=3¹⁴.2

=>3¹⁴=3^x=>x=4

Answer 4

ghi nhầm x=14

Answer 5

2 . 3^x = 10 . 3¹² + 8 . 27⁴
2 . 3^x = 10 . 3¹² + 8 . 3¹²
2 . 3^x = 3¹² .( 10+ 8 )
2 . 3^x = 3¹² . 2 . 3²
2 . 3^x = 3¹⁴ . 2
^{=> x=14}

 

Answer 6

\(2.3^x=10.3^{12}+8.27^4\)

\(\Rightarrow2.3^x=10.3^{12}+2^3.\left(3^3\right)^4\)

\(\Rightarrow2.3^x=10.3^{12}+2^3.3^{12}\)

\(\Rightarrow3^x.2=3^{12}\left(10+8\right)\)

\(\Rightarrow3^x.2=3^{12}.18\)

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Answer 7

2 . 3^x =10 . 3^12 + 8 . 27^4

2 . 3^x =10 . 3^3.4 +8 . 27^4

2 . 3^x =10  . 27^4 +8 . 27^4

2 . 3^x =(10+8) .  27^4

2 . 3^x = 18 . 27^4

2 . 3^x =2 . 3^2 . 3^12

2.3^x =2 . 3^14

sr: 3^x=3^14        sr:x=14    vậy=14