By Π’ΠΈΠΌΠΎΡΠ΅Π΅Π²Π° Π‘ΠΎΡΡΡ ΠΠ½Π°ΡΠΎΠ»ΡΠ΅Π²Π½Π° , β¦
ΠΠ½ΠΈΠ³Π° Π΄Π»Ρ ΡΠ°Π·Π²ΠΈΡΠΈΡ ΠΌΠ°ΡΠ΅ΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΈΡ ΡΠΏΠΎΡΠΎΠ±Π½ΠΎΡΡΠ΅ΠΉ.
A book for developing mathematical skills.
US: temporary delays β postal services aligning new import rules, 
Europe: 1β2 weeks, π Worldwide: 1β4 weeks βοΈ