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pkg math/big, func NewRat(int64, int64) *Rat
pkg math/big, method (*Int) Abs(*Int) *Int
pkg math/big, method (*Int) Add(*Int, *Int) *Int
pkg math/big, method (*Int) And(*Int, *Int) *Int
pkg math/big, method (*Int) AndNot(*Int, *Int) *Int
pkg math/big, method (*Int) Binomial(int64, int64) *Int
pkg math/big, method (*Int) Bit(int) uint
pkg math/big, method (*Int) BitLen() int
pkg math/big, method (*Int) Bits() []Word