Efectuați calculele și scrieți rezultatul în forma cea mai simplă: a) (–2 + 1) + 3( –2); b) (2 + 3)( – 1) + (3 – 2)(– + 5); c) (–5 + 2)(3 – 1) + (15 + 7)( – 3); d) ( – 1)(–5 + 3) + 5( – 1); e) ( + 2)(2 – 2 + 4) – 3 + 8; f) (2 –1)(42 + 2 + 1) + 1 – 83.

Select the correct answer. given: ∆abc with prove: statement reason 1. given 2. ∠cab ≅ ∠edb ∠acb ≅ ∠deb if two parallel lines are cut by a transversal, the corresponding angles are congruent. 3. ∆abc ~ ∆dbe aa criterion for similarity 4. corresponding sides of similar triangles are proportional. 5. ab = ad + db cb = ce + eb segment addition 6. substitution property of equality 7. division 8. subtraction property of equality what is the missing statement in the proof? scroll down to see the entire proof.