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#1
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#2
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$a^2b+ab^2+a+b+8ab=83$
$(a+b)^3=a^3+b^3+3a^2b+3ab^2$ $ab(a+b)+a+b+8ab=83$ $(ab+1)((a+b)+8)=91=7\times 13$ $ab+1=7,(a+b)+8=13\rightarrow a+b=5,ab=6 \rightarrow a=3,b=2$ $(a+b)^3=5^3=125$
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#3
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