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a+b=250
a-b=30 a,b=? explicatie la general


Răspuns :

a+b=250
a-b=30

a=30+b

b+30+b=250
2b+30=250
2b=250-30
2b=220
b=220:2
b=110

a=110+30
a=140
a+b=250
a-b=30

a=30+b
_______________

30+b+b=250
2b=250-30
2b=220
b=220÷2
b=110

a+110=250
a=250-110
a=140

a=140
b=110

Proba:
140+110=250
140-110=30

Sper ca te-am ajutat! Succes!