Răspuns :
a)3898+3900=7798
b)3586-1672=1914
1914+3214=5128
c)3145+1672=4817
3145-1672=1473
4817-1472=3345
b)3586-1672=1914
1914+3214=5128
c)3145+1672=4817
3145-1672=1473
4817-1472=3345