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a+b=38,b+c=72,2a+3b+c=?​

Răspuns :

1+37=38, 37+c=72, c=72-37, c=35, 2×1+3×37+35= 2+111+35=148

a + b = 38 =>

2a + 2b = 76

adunam relatiile

2a + 2b + b + c = 76 + 72

2a + 3b + c = 148