已知8³=a九次方=2b次方求2[a-1/3b]-2b(a²-3b)的值
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已知8³=a九次方=2b次方求2[a-1/3b]-2b(a²-3b)的值
已知8³=a九次方=2b次方求2[a-1/3b]-2b(a²-3b)的值
已知8³=a九次方=2b次方求2[a-1/3b]-2b(a²-3b)的值
a的九次方=a³×a³×a³ 8的三次方=2³×2³×2³既a=2
8的三次方=2的九次方=2的b次方 即b=9
2[a-1/3b]-2b(a²-3b)=2(1/27)-18(4-27)=2/27+414=11180/27
a=2. b=9
剩下自己算吧
8的3次方等于2的九次方。可知a等于2,b等于9