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leratarasova21
@leratarasova21
September 2021
2
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Найдите сумму первых двадцати членов арифметической прогрессии 50, 47, 44…
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MissMistic1
/////////////////////////////
2 votes
Thanks 9
mishutik2011
50+47+44+41+38+35+32+29+26+23+20+17+14+11+8+5+2+(-1)+(-4)+(-7)=430
2 votes
Thanks 6
mishutik2011
:D
mishutik2011
Когда не помнишь формулы
leratarasova21
Это уж точно)
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