Math Problem Statement
جملات سوم و پنجم و نهم یک دنباله حسابی،سه جمله متوالی یک دنباله هندسی هستند.اگر قدر نسبت دنباله حسابی صفر نباشد،جمله اول دنباله حسابی چند است؟
Solution
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Math Problem Analysis
Mathematical Concepts
Arithmetic Sequence
Geometric Sequence
Algebra
Formulas
a_n = a_1 + (n-1)d (Arithmetic Sequence Formula)
a_5^2 = a_3 * a_9 (Geometric Sequence Property)
Theorems
Property of Arithmetic Sequence: nth term formula
Property of Geometric Sequence: The square of the middle term is the product of the first and last terms
Suitable Grade Level
Grades 10-12