в геометрической прогрессии известно, что S6=84, q=-0,5. найдите b1-?
S6=b1*(q^6-1)/(q-1)
b1=S6*(q-1)/(q^6-1)
b1=84*(-3/2)/(-63/64)
b1=84*3/2*64/63
b1=128
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S6=b1*(q^6-1)/(q-1)
b1=S6*(q-1)/(q^6-1)
b1=84*(-3/2)/(-63/64)
b1=84*3/2*64/63
b1=128