解 :?$ (1) $?因為?$3^{44}=(3^4)^{11}=81^{11},$??
$4^{33}=(4^3)^{11}=64^{11},$??
$5^{22}=(5^2)^{11}=25^{11},$?且?$81>64>25,$?
所以?$81^{11}>64^{11}>25^{11},$?即?$3^{44}>4^{33}>5^{22};$?
?$ (2) $?因為?$81^{31}=(3^4)^{31}=3^{124},$
??$27^{41}=(3^3)^{41}=3^{123},$
??$9^{61}=(3^2)^{61}=3^{122},$?且?$124>123>122,$
?所以?$3^{124}>3^{123}>3^{122},$?即?$81^{31}>27^{41}>9^{61};$?
?$ (3) $?因為?$a^2=2,$??$b^3=3,$?
所以?$a^6=(a^2)^3=8,$??$b^6=(b^3)^2=9,$
?因為?$8<9,$?且?$a>0,$??$b>0,$?
所以?$a < b;$?
?$ (4) $?因為?$3^{12}×5^{10}=3^{10}×3^2×5^{10},$
??$3^{10}×5^{12}=3^{10}×5^{10}×5^2,$?且?$3^2<5^2,$?
所以?$3^{12}×5^{10}<3^{10}×5^{12}。$?