Răspuns :
Modelul 1
9x129=1161
Modelul 2
6x129+3x129=774+387=1161
Modelul 1
394x4=1576
Modelul 2
394x9-394x5=3546-1970=1576
9x129=1161
Modelul 2
6x129+3x129=774+387=1161
Modelul 1
394x4=1576
Modelul 2
394x9-394x5=3546-1970=1576
(6+3)·129=9·129=1161
(6+3)·129=6·129+3·129=774+387=1161
394·(9-5)=394·4=1576
394·(9-5)=394·9-394·5=3546-1970=1576
(6+3)·129=6·129+3·129=774+387=1161
394·(9-5)=394·4=1576
394·(9-5)=394·9-394·5=3546-1970=1576