Question

Daca a=5 si b+c+d=9 , aunci a(b+c)-ad=

Answer 1

a[tex] \left \{ {{a=5} \atop {b+c=9-d}} \right. [/tex]  a(b+c)-ad=5(9-d)-5d=45-5d-5d=45-10d=0 => d=4,5    b+c=9-d<=>b+c=4,5 => a(b+c)-ad=5x4,5-5x4,5=0
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