.铜 铁 铝
密度之比 8.9 :7.9 :2.7 = 89 :79 :27
体积之比:1/8.9 :1/7.9 :1/2.7 = 2133:2403 :7031
边长之比:③√2133:③√2403 :③√7031 ③√ 指开三次方
面积之比:(③√2133)^2 :(③√2403 )^2 :(③√7031)^2
.铜 铁 铝
密度之比 8.9 :7.9 :2.7 = 89 :79 :27
体积之比:1/8.9 :1/7.9 :1/2.7 = 2133:2403 :7031
边长之比:③√2133:③√2403 :③√7031 ③√ 指开三次方
面积之比:(③√2133)^2 :(③√2403 )^2 :(③√7031)^2