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a+b =100 a-b=32
Repede dau 20 pt+coroana


Răspuns :

A+B=100
A-B=32
A=B+32
B+32+B=100
2B=68
B=34
A=34+32=66
a+b=100=) a=100-b
a-b=32=) 100-b-b=32=) -2b=32-100=)2b=68=)b=34
a=100-b=100-34=66