1.60
[tex]\dfrac{4^{28}+4^{28}+4^{28}+4^{28}}{2}=\dfrac{4\cdot4^{28}}{2}=\dfrac{4^{1+28}}{2}=\dfrac{4^{29}}{2}=\dfrac{(2^2)^{29}}{2}=\dfrac{2^{2\cdot29}}{2}=\dfrac{2^{58}}{2}=\\=2^{58-1}=2^{57}[/tex]
1.61
[tex]x^2-6x+9=(x-3)^2=(\sqrt3+3-3)^2=(\sqrt3)^2=3[/tex]
1.62
[tex]\dfrac{2^{50}\cdot3^{40}}{36^{10}}=\dfrac{2^{50}\cdot3^{40}}{(6^2)^{10}}=\dfrac{2^{50}\cdot3^{40}}{6^{20}}=\dfrac{2^{50}\cdot3^{40}}{(2\cdot3)^{20}}=\dfrac{2^{50}\cdot3^{40}}{2^{20}\cdot3^{20}}=2^{30}\cdot3^{20}[/tex]
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1.60
[tex]\dfrac{4^{28}+4^{28}+4^{28}+4^{28}}{2}=\dfrac{4\cdot4^{28}}{2}=\dfrac{4^{1+28}}{2}=\dfrac{4^{29}}{2}=\dfrac{(2^2)^{29}}{2}=\dfrac{2^{2\cdot29}}{2}=\dfrac{2^{58}}{2}=\\=2^{58-1}=2^{57}[/tex]
1.61
[tex]x^2-6x+9=(x-3)^2=(\sqrt3+3-3)^2=(\sqrt3)^2=3[/tex]
1.62
[tex]\dfrac{2^{50}\cdot3^{40}}{36^{10}}=\dfrac{2^{50}\cdot3^{40}}{(6^2)^{10}}=\dfrac{2^{50}\cdot3^{40}}{6^{20}}=\dfrac{2^{50}\cdot3^{40}}{(2\cdot3)^{20}}=\dfrac{2^{50}\cdot3^{40}}{2^{20}\cdot3^{20}}=2^{30}\cdot3^{20}[/tex]