139*15+18*139+15*261+18*261=

Question

139*15+18*139+15*261+18*261=

Answer 1

=139•(15+18)+261•(15+18)=139•33+261•33=33•(139+261)=33•400=13200

Answer 2

139*15+18*139+15*261+18*261=139*(15+18)+261*(15+18)=(139+261)*(15+18)=33*400=13200