Ответ:
а4=11
а6=17
_______
S11-?
a6=a4+2d => d=(a6-a4)/2
d=(17-11)/2=3
a4=a1+3d => a1=a4-3d
a1=11-3*3=2
S11=(2а1+d(n-1))*n/2=(2*2+3(11-1))*11/2=34*11/2=17*11=187
Объяснение:
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Ответ:
а4=11
а6=17
_______
S11-?
a6=a4+2d => d=(a6-a4)/2
d=(17-11)/2=3
a4=a1+3d => a1=a4-3d
a1=11-3*3=2
S11=(2а1+d(n-1))*n/2=(2*2+3(11-1))*11/2=34*11/2=17*11=187
Объяснение: