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Afla valorile literelor a si b: a × a + 8 =89 ; b × b - 12 = 52 ; a × a-19 = 30 ; a × b -12 = 60

Răspuns :

89-8=81:2=40,5
52+12=64
30+19-=49:2=24,5
60+12=72:2=