Răspuns:
[tex]7.)5^2+3^3=25+27=52\\\\\\8.)9^{22} =(9^2)^{11} =(9^{11} )^2-p.p\\\\15^{42} =(15^{21} )^2-p.p\\\\7^{32x+4y} =(7^{16x+2y} )^2-p.p\\\\\\9.)5^{21} =(5^7)^3-c.perf.\\\\31^{42} =(31^{14} )^3-c.perf.\\\\9^{33x+18y} =(9^{11x+6y} )^3-c.perf.\\\\\\11.)2^{17}*(2^3+2^2-1):11=2^{17} *11:11=2^{17} \\\\3^{22} *(3^3-3+1):25=3^{22} *25:25=3^{22}\\\\5^{n} *(5^2+5^1-1)=5^{n} *29\\\\2^{n} *3^{n} *(2^2*3-1)=2^{n} *3^{n}*11[/tex]
