8t-18t^(-3) = 0 8+54t^(-4) = 0 求t是两题哦8t-18t^(-3) = 08+54t^(-4) = 0 求t希望能列出来怎么算的,

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8t-18t^(-3)=08+54t^(-4)=0求t是两题哦8t-18t^(-3)=08+54t^(-4)=0求t希望能列出来怎么算的,8t-18t^(-3)=08+54t^(-4)=0求t是两题哦

8t-18t^(-3) = 0 8+54t^(-4) = 0 求t是两题哦8t-18t^(-3) = 08+54t^(-4) = 0 求t希望能列出来怎么算的,
8t-18t^(-3) = 0 8+54t^(-4) = 0 求t
是两题哦
8t-18t^(-3) = 0
8+54t^(-4) = 0
求t
希望能列出来怎么算的,

8t-18t^(-3) = 0 8+54t^(-4) = 0 求t是两题哦8t-18t^(-3) = 08+54t^(-4) = 0 求t希望能列出来怎么算的,
8t - 18t^(-3)=0
2t[4 - 9t^(-4)]=0
2t=0或4 - 9t^(-4)=0
解得:t=0
或9t^(-4)=4
t^(-4)=4/9
1/t^4=4/9
(1/t)^4=[±(√2)/(√3)]^4
t=±(√6)/2
∴t=(√6)/2或t=-(√6)/2

8 + 54t^(-4)=0
t^(-4)=-8/54
1/t^4=-8/54
∵t^4>0
∴方程无实数解