a¹=-10
a⁴=2
Так как
a n=a¹+3d
3d=12
d=4
a¹⁴=a¹+13d=-10+13×4=42
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a¹=-10
a⁴=2
Так как
a n=a¹+3d
3d=12
d=4
a¹⁴=a¹+13d=-10+13×4=42