ответ: -425
A1=9-2=7A2=9-4=5d=5-7=-2
S25=2a1+d(n-1) * n=14-48 *25=-425 2 2
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ответ: -425
A1=9-2=7
A2=9-4=5
d=5-7=-2
S25=2a1+d(n-1) * n=14-48 *25=-425
2 2