⑴4x^2+1/(4x^2) ⑵8x^3+1/(8x^3)
=[2x+1/(2x)]^2-2 =[2x+1/(2x)][4x^2-1+1/(4x^2)]
=(√7)^2-2 =√7(5-1)
=7-2 =4√7
=5
⑶64x^6+1/(64x^6)
=[8x^3+1/(8x^3)]^2-2
=(4√7)^2-2
=112-2
=110
⑴4x^2+1/(4x^2) ⑵8x^3+1/(8x^3)
=[2x+1/(2x)]^2-2 =[2x+1/(2x)][4x^2-1+1/(4x^2)]
=(√7)^2-2 =√7(5-1)
=7-2 =4√7
=5
⑶64x^6+1/(64x^6)
=[8x^3+1/(8x^3)]^2-2
=(4√7)^2-2
=112-2
=110
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