АРИФМЕТИЧЕСКАЯ ПРОГРЕССИЯ а8+а6=16 а2*а12=-36 РЕШИТЬ!!!!!!!!Найти а1 и d
a1+7d+a1+5d=16 2a1+12d=16 a1+6d=8 a1=8-6d
a1+d)(a1+11d)=-36 (8-6d+d)(8-6d+11d)=-36 (8-5d)(8+5d)=-36
64-25d^2=-36
25d^2=100
d^2=25
d1=-5 a1=8+30=38
d2=5 a1=8-30=-22
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a1+7d+a1+5d=16 2a1+12d=16 a1+6d=8 a1=8-6d
a1+d)(a1+11d)=-36 (8-6d+d)(8-6d+11d)=-36 (8-5d)(8+5d)=-36
64-25d^2=-36
25d^2=100
d^2=25
d1=-5 a1=8+30=38
d2=5 a1=8-30=-22