b4=7/15*-1^4-1
b4=7/15*-1^3
b4=7/15*-1
b4=-7/15
Г)-7/15
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b4=7/15*-1^4-1
b4=7/15*-1^3
b4=7/15*-1
b4=-7/15
Г)-7/15