Ready-to-use answers for the by O.A. Zakharova and E.P. Yudina (part of the "Perspective Primary School" series) are available online for free.
: Provides comprehensive answers for the 2018 edition and onwards. reshebnik po matematike 3 klass zakharova iudina besplatno
You can find the specific solutions for parts 1, 2, and 3 through the following popular resources: Ready-to-use answers for the by O