?$2+3+5=10,$?
?$90\times 3\times \dfrac{2}{10}$?
?$=270\times \dfrac{2}{10}$?
?$ =54$?
?$90\times 3\times \dfrac{3}{10}$?
?$=270\times \dfrac{3}{10}$?
?$ =81$?
?$90\times 3\times \dfrac{5}{10}$?
?$=270\times \dfrac{5}{10}$?
?$ =135$?
?$ 答:甲數是54、乙數是81、丙數是135。$?