a) \(20\cdot2^x+1=10\cdot4^2+1\)

\(\Leftrightarrow2\cdot10\cdot2^x=10\cdot4^2\)

\(\Leftrightarrow10\cdot2^{x+1}=10\cdot2^4\)

\(\Rightarrow x+1=4\)

\(\Rightarrow x=3\)

b) \(\left(4-\frac{x}{2}\right)^3-1=2\cdot\left(2^3-\frac{5}{2^0}\right)+1\)

\(\Leftrightarrow\left(4-\frac{x}{2}\right)^3=2\cdot3+1+1\)

\(\Leftrightarrow\left(4-\frac{x}{2}\right)^3=8=2^3\)

\(\Rightarrow4-\frac{x}{2}=2\)

\(\Leftrightarrow\frac{x}{2}=2\)

\(\Rightarrow x=4\)

Bài 2a:

5^98 + 5^97 + 5^96 = 5^x.5^x+1.5^x+2.31

5^96(5^2+ 5 + 1) = 5^(x+x+1+x+2).31

5^96.(25+ 5+ 1) = 5^(3x+3).31

5^96.31 = 5^(3x+3).31

5^96 = 5^(3x+ 3).(31 : 31)

5^96 = 5^(3x+ 3)

3x+ 3 = 96

3x = 96 - 3

3x = 93

x = 93 : 3

x = 31

Vậy x = 31

Bài 2b:

B = \(\frac{x-3}{\left(x+1\right)\left(x-1\right)}\)

Biểu thức B có nghĩa khi và chỉ khi:

(\(x\) + 1)(\(x-1\)) ≠ 0

\(x+1\) ≠ 0 và \(x-1\) ≠ 0

\(x\) ≠ -1 và \(x\) ≠ 1

nhầm câu c) là 2¹⁸

1)

\(222^{333}\)   và  \(333^{222}\)

\(222^{333}=\left(222^3\right)^{111}=10941048^{111}\)

\(333^{222}=\left(333^2\right)^{111}=110889^{111}\)

 vì \(10941048^{111}>110889^{111}\Rightarrow222^{333}>333^2\)

 2)

\(1x8y2⋮36\Rightarrow1x8y2⋮4;1x8y2⋮9\)

\(1x8y2⋮4\Leftrightarrow y2⋮\Leftrightarrow y=\left\{1;5;9\right\}\)

-nếu\(y=1\Rightarrow1x812⋮9\Leftrightarrow\left(1+x+8+1+2\right)⋮9\Leftrightarrow12+x⋮9\Leftrightarrow x=6\)nếu \(y=5\Rightarrow1x852⋮9\Leftrightarrow\left(1+x+8+5+2\right)⋮9\Leftrightarrow16+x⋮9\Leftrightarrow x=2\)nếu \(y=9\Rightarrow1x892⋮9\Leftrightarrow\left(1+x+8+9+2\right)⋮9\Leftrightarrow20+x⋮9\Leftrightarrow x=7\) 

\(a,3^n=3^4\)

\(\Rightarrow n=4\)

\(b,2008^n=2008^0\)

\(\Rightarrow n=0\)

1. 18,21,24

3.ta có \(3^{50}=3^{48}.3^2\)Do \(3^2>8\Rightarrow3^{50}>8.3^{48}\)

4.  \(2^{100}=2^{97}.2^3do2^3< 9\Rightarrow2^{100}< 9.2^{97}\)

5. \(x=9\)

a) \(2^4x-3.5x=5^2-2^2\)

\(16x-15x=25-4\)

\(x=21\)

vậy \(x=21\)

b) \(3^2x+2^2x=26.2^2-13\)

\(9x+4x=104-13\)

\(13x=91\)

\(x=7\)

vậy \(x=7\)

c) \(5^2x-2^4x=3^4-6.3^3\)

\(25x-16x=81-162\)

\(9x=-81\)

\(x=-9\)

vậy \(x=-9\)