4r=14-8
4r=6
r=1,5
a1= 8-4*1,5=2
S= (2a1+(n-1)r)*n/2
1312=(4+1,5n-1,5)n/2/*2
2624=2,5n+1,5n²/*2
3n²+5n-5248=0
Δ=25+62976=63001
√Δ=251
n=(-5+251):6= 246:6=41
Odp. nalezy dodac 41 wyrazow.
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4r=14-8
4r=6
r=1,5
a1= 8-4*1,5=2
S= (2a1+(n-1)r)*n/2
1312=(4+1,5n-1,5)n/2/*2
2624=2,5n+1,5n²/*2
3n²+5n-5248=0
Δ=25+62976=63001
√Δ=251
n=(-5+251):6= 246:6=41
Odp. nalezy dodac 41 wyrazow.