a₁=8,5
r=-2,2
S₁₀=[2a₁+(n-1)×r]/2×n
S₁₀=[2×8,5+(10-1)×(-2,2)]/2×10
S₁₀=[17-19,8]×5
S₁₀=-14
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a₁=8,5
r=-2,2
S₁₀=[2a₁+(n-1)×r]/2×n
S₁₀=[2×8,5+(10-1)×(-2,2)]/2×10
S₁₀=[17-19,8]×5
S₁₀=-14
a₁=8,5
r=-2,2
S₁₀=[2a₁+(n-1)×r]/2×n
S₁₀=[2×8,5+(10-1)×(-2,2)]/2×10
S₁₀=[17-19,8]×5
S₁₀=-14