Объяснение:
b₇=b₁⋅ qⁿ⁻¹=18⋅( 1/9)⁶=9⋅ 2⋅ 1/9⁶=2/9⁵=2/59049
b₅=64⋅ (1/4)⁴=4³⋅ 1/4⁴=1/4=0,25
b₈=4⋅ (-1/2)⁷=2²⋅ (-1)/2⁷=-1/2⁵=-1/32
b₉=-625⋅ (-1/5)⁸=-5⁴⋅ 1/5⁸=-1/5⁴=-1/625
Объяснение:
b₇=b₁⋅ qⁿ⁻¹=18⋅( 1/9)⁶=9⋅ 2⋅ 1/9⁶=2/9⁵=2/59049
b₅=64⋅ (1/4)⁴=4³⋅ 1/4⁴=1/4=0,25
b₈=4⋅ (-1/2)⁷=2²⋅ (-1)/2⁷=-1/2⁵=-1/32
b₉=-625⋅ (-1/5)⁸=-5⁴⋅ 1/5⁸=-1/5⁴=-1/625