if x= 1/5–x and x≠ 5, find : x³+1/x³
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- given, x= 1/5-x
- 2x= 1/5
- x= 1/10
- and , 1/x=10
- x^3+1/x^3= 1/10^3+10^3
- =0.1^3+1000
- =0.001+1000
- =1000.001
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