Question

Scrie si calculeaza, in doua moduri , expresii al carora rezultat este de doua ori mai mic , respectiv de patru ori mai mare decat al celor date ,dupa exemplu de mai jos. b ) 238+106 c ) 1000+500 . Calculat in doua moduri .

Answer 1

b) 238 + 106

(238+106):2=344:2=172

(238+106):2=238:2+106:2=119+53=172

(238+106)×4=344×4=1 376

(238+106)×4=238×4+106×4=952+424=1 376

c) 1 000 + 500

(1 000+500):2=1 500:2=750

(1 000+500):2=1 000:2+500:2=500+250=750

(1 000+500)×4=1 500×4=6 000

(1 000+500)×4=1 000×4+500×4=4 000+2000
= 6 000