Question

daca a+b+b+a=56,iar a-b=8, atunci a=?, 26:(a+b)=?

Answer 1

a-b=8⇒a=b+8
atunci a+b+b+a=(b+8)+b+b+(b+8)=56
b·4+8·2=56
b·4=56-16
b·4=40
b=40:4
b=10⇒a=10+8
a=18
26:(a+b)
26:(10+18)
26:28=0.92