Ответы на вопрос:
A17=2.7 d=0.1 s12-? s12=a1+a12 *12 2 a17=a1+16d 2.7=a1+16*0.1 2.7=a1+1.6 a1=1.1 a12=a1+11d a12=1.1+11*0.1 a12=1.1+1.1 a12=2.2 s12=1.1+2.2 *12 2 s12=3.3 *12 2 s12=1.65*12 s12=19.8
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