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f(x)=x^2.98,
f'(x)=2.98x^1.98,
f(x0+△x)≈f(x0)+f'(x0)*△X,
所以
f(1.007)
≈f(1)+f'(1)*0.007
=1^2.98+2.98*1^1.98*0.007
=1+2.98*1*0.007
=1+(3-0.02)*0.007
=1+0.021-0.00014
=1.02086
f'(x)=2.98x^1.98,
f(x0+△x)≈f(x0)+f'(x0)*△X,
所以
f(1.007)
≈f(1)+f'(1)*0.007
=1^2.98+2.98*1^1.98*0.007
=1+2.98*1*0.007
=1+(3-0.02)*0.007
=1+0.021-0.00014
=1.02086
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