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Răspuns:
a.
[tex] {2}^{17} \times {2}^{21} = {2}^{17 + 21} = {2}^{38} [/tex]
b.
[tex] {3}^{45} \times {3}^{87} \times {3}^{55} = {3}^{45 + 87 + 55} = {3}^{187} [/tex]
c.
[tex] {7}^{19} \times {7}^{83} \times {7}= {7}^{19 + 83 +1} = {7}^{103} [/tex]