х1 = х2 - d
х1 = -2-12= -3,6
Sn= 2а1 + d(n-1) /2 *10
S10 = -7.2 + 10.8 / 2*10
S10 = 18
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х1 = х2 - d
х1 = -2-12= -3,6
Sn= 2а1 + d(n-1) /2 *10
S10 = -7.2 + 10.8 / 2*10
S10 = 18