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- {1 система} (Σt^2)*a+(Σt)*b=Σ(y*t)
- (Σt)*a+n*b=Σy //(n=12)
- {2 система} (Σt^4)*a+(Σt^3)*b+(Σt^2)*c=Σ(y*t^2)
- (Σt^3)*a+ (Σt^2)*b+(Σt)*c=Σ(y*t)
- (Σt^2)*a+(Σt)*b+nc=Σy
- {3 система} (Σt^2)*lna+(Σt)*lnb=Σ(lny*t)
- (Σt)*lna+n*lnb=Σlny
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