\(a,=7^4\\ b,=3.5.3.5.3.5=3^3.5^3\\ c,=2^3.5^2\\ d,=10^5\)

\(c,3x+91=-2\\ 3x=-2-91\\ 3x=-93\\ x=-31\\ c,-18x=36\\ x=-2\\ c,-152-\left(3x+1\right)=54\\ 3x+1=-152-54\\ 3x+1=-206\\ 3x=-206-1\\ 3x=-207\\ x=-69\)

D

\(d,73-x=89-20\\ 73-x=69\\ x=73-69\\ x=4\\ e,x+7=13+25\\ x+7=38\\ x=38-7\\ x=31\\ f,x+4=198-120\\ x+4=78\\ x=78-4\\ x=74\\ m,x-9=350:5\\ x-9=70\\ x=70+9\\ x=79\\ n,2x-49=45\\ 2x=45+49\\ 2x=94\\ x=47\\ o,2x+6=200-64\\ 2x+6=136\\ 2x=136-6\\ 2x=130\\ x=65\)

\(A=\dfrac{\sqrt{2.3}\left(\sqrt{3}-\sqrt{2}\right)}{\sqrt{2}-\sqrt{3}}+\dfrac{\sqrt{5}\left(\sqrt{3}-1\right)}{\sqrt{3}-1}=\dfrac{-\sqrt{6}\left(\sqrt{2}-\sqrt{3}\right)}{\sqrt{2}-\sqrt{3}}+\dfrac{\sqrt{5}}{1}=-\sqrt{6}+\sqrt{5}\)

\(A\\ 12.1^3+2a+a^2=a^2+2a+12\\ B=2.\left(-2\right)^2-\left|2a+3\right|.\left(-2\right)+a^2=8-\left|2a+3\right|.\left(-2\right)+a^2\)

\(TH1\left|2a+3\right|=2a+3\)

\(a^2+2a+12=8-\left(2a+3\right).\left(-2\right)+a^2\\ a^2+2a+12-8-4a-6-a^2=0\\ -2a-2=0\\ -2a=2\\ a=-1\)

\(TH2\left|2a+3\right|=-2a-3\)

\(a^2+2a+12=8-\left(-2a-3\right).\left(-2\right)+a^2\\ a^2+2a+12-8+\left(-2a-3\right).\left(-2\right)-a^2=0\\ 2a+4+4a+6=0\\ 6a+10=0\\ 6a=-10\\ a=-\dfrac{10}{6}\)

Ông  , Sáng , Xỉn , Chiều , Shay 

\(a,5^x=5^4\\ x=4\\b,12^x=12^2\\ x=2\\ c,2^x =128:16\\ 2^x=8\\ 2^x=2^3\\ x=3\\ d,3^x=27.9\\ 3^x=243\\ 3^x=3^5\\ x=5\)