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Stiind ca 8xa+6xb=86 si 8xa +10xb=106,afla a si b

Răspuns :

8×a+10×b= 106
8×a+6×b = 86
____________ ( - )
// 4×b = 20
b = 20:4
b = 5
10b = 10×5 = 50
a = (106-50):8 = 56:8 = 7

a= 7
b = 5