Răspuns:
a)254×49=12.446
149×54=8.046
12.446-8.046=4.400
b)36÷4=9
9876×9=88.884
c)45×38=1710
139×72=10.008
545×127=69.215
1.710+10.008+69.215=80.933
d)78×49=3.822
81÷9=9
3.822-9=3.813
e)229×2=458
139×3=417
458-417=41
f)105+236=341
341×3=1023
1275-1078=197
197×2=394
1023-394=629
