Abstract In this paper, some properties of continuous functions in
$q$-analysis are investigated. The behavior of $q$-derivative in
a neighborhood of a local extreme point is described. Two
theorems are proved which are $q$-analogons of the fundamental
theorems of the differential calculus. Also, two $q$-integral mean
value theorems are proved and applied to estimating remainder term
in $q$-Taylor formula. Finally, the previous results are used in
considering some new iterative methods for equation solving.
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