Răspuns :
54×47+a=20000
2538+a=20000
a=20000-2538
a=17462
a+38×28=5003
a+1064=5003
a=5003-1064
a=3939
2538+a=20000
a=20000-2538
a=17462
a+38×28=5003
a+1064=5003
a=5003-1064
a=3939
54x47+a=20000
2538+a=20000
a=20000-2538
a=17462
a+38x28=5003
a+1064=5003
a=5003-1064
a=3939