[tex]A)7^2:\{17^2:289+2*[(2^3)^{15}:2*2^{43}*3^{15}+1^{100}]\}=\\
49:\{289:289+2*[2^{45}:2^{44}*3^{15}+1]\}=\\
49:[1+2*(2*3^{15}+1)]=\\
49:[1+4*3^{15}+2]=\\
49:(3+3^{15}*4)=\frac{49}{3(1+3^{14}*4}\\
b)3^7+3^6=\\
3^6(1+3)=\\
3^6*4=\\
(3^3)^2*2^2=\\
(3^3*2)^2=54^2[/tex]