Răspuns :

Răspuns:

137*9=137*(10-1)=137*10-137-1

137*9=1233=137*9=1370-137*1

137*9=1233=137*9=1233=1233

239*11=239*(10-1)=239*10+239*1

239*11=2629=239*9=2390*1

239*11=2629=239*9=2151=2390