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MK20
@MK20
July 2022
1
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арифметическая прогрессия:
a2= -2.4
a5= 19.2
найти а4 с объяснением
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sokolanna
По формуле: an = a1 + d ( n – 1 )
а2=а1+1d=-2,4
-
a5=a1+4d=19,2
=> -3d=-21,6 , d=7,2
a1=19,6-4*7,2=-9,6
a4=a1+3d=-9,6+3*7,2=12
2 votes
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Answers & Comments
а2=а1+1d=-2,4
-
a5=a1+4d=19,2
=> -3d=-21,6 , d=7,2
a1=19,6-4*7,2=-9,6
a4=a1+3d=-9,6+3*7,2=12