Question

efectuati utilizand factorul comun : a) 12×13+12×15+12×72 b) 125×234-125×28+125+198 c) 702×256-702×55+702×799 b) 1000×372+259×1000-153×1000.​

Answer 1

Răspuns:

a) 1200

b) 50500

c) 702000

d) 478000

Explicație pas cu pas:

a)

12 × 13 + 12 × 15 + 12 × 72 =

12 × (13 + 15 + 72) =

12 × 100 =

1200

b)

125 × 234 - 125 × 28 + 125 × 198 =

125 × (234 - 28 + 198) =

125 × 404 =

50500

c)

702 × 256 - 702 × 55 + 702 × 799 =

702 × (256 - 55 + 799) =

702 × 1000 =

702000

d)

1000 × 372 + 259 × 1000 - 153 × 1000 =

1000 × (372 + 259 - 153) =

1000 × 478 =

478000