(bn) - арифметическая прогрессия. b4=3, b9= -17. Найдите разность этой прогрессии.
b4=b1+3d
b9=b1+8d
3=b1+3d
-17=b1+8d
eto sistema, iz pervoi vychityvaem vtoruyu
20=-5d
d=-4
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b4=b1+3d
b9=b1+8d
3=b1+3d
-17=b1+8d
eto sistema, iz pervoi vychityvaem vtoruyu
20=-5d
d=-4