Răspuns :
(a+b)×(2×a+5-3×b)=
=(10+7)×(2×10+5-3×7)=
=17×(20+5-21)=
=17×(25-21)=
=17×4=68
a=10
b= 7
( 10+7) × ( 2×10+5-3×7)=
17 × ( 20 +5-21) =
17 × ( 25-21 )=
17×4=68
(a+b)×(2×a+5-3×b)=
=(10+7)×(2×10+5-3×7)=
=17×(20+5-21)=
=17×(25-21)=
=17×4=68
a=10
b= 7
( 10+7) × ( 2×10+5-3×7)=
17 × ( 20 +5-21) =
17 × ( 25-21 )=
17×4=68