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Roni00
@Roni00
August 2022
1
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составьте формулу n-ого члена арифметической прогрессии: а9 = -30; а10 = -45
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igir12370
D=-45-(-30)=-45+30=-15
a9=a1+d(9-1)
-30=a1-15*8
a1=120-30=90
an=a1+d(n-1)
an=90-15(n-1)
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Answers & Comments
a9=a1+d(9-1)
-30=a1-15*8
a1=120-30=90
an=a1+d(n-1)
an=90-15(n-1)