Răspuns :
a)
1.250+a=3.172
a=3.172-1.250
a=1.922
b)
4.200-x=2.007
x=4.200-2.007
x=2.193
c)
n-1.980=2.016
n=1.980+2.016
n=3.996
1.250+a=3.172
a=3.172-1.250
a=1.922
b)
4.200-x=2.007
x=4.200-2.007
x=2.193
c)
n-1.980=2.016
n=1.980+2.016
n=3.996