Urgent!!!!... Dau coroana
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Explicație pas cu pas:
b4= b1×q³= 4×3³= 4×27= 68
b7=b1×q^6= 4×3^6= 4×27×27=2916
b10= b1× q^9= 4×3^10= 4×2916×27=314928
S8= b1×(q^7-1)/(q-1)= 4×(3^7-1)/2= 4×2186/2=4x1093= 4372