Question

Calculati folosind scoaterea unui factor comun b)38x643-255x38+38x612
C)47x529+616x47-47x145

Answer 1

b)

38x643-255x38+38x612  =

38 x (643 - 255 + 612) =

38 x 1000 =

38000

c)

47x529+616x47-47x145 =

47 x (529 + 616 - 145) =

47 x 1000 =

47000

Answer 2

b)   38 × 643 - 255 × 38 + 38 × 612 = 38 000

= 38 × ( 643 - 255 + 612 ) =

= 38 × ( 388 + 612 ) =

= 38 × 1 000 =

= 38 000

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c)   47 × 529 + 616 × 47 - 47 × 145 = 47 000

= 47 × ( 529 + 616 - 145 ) =

= 47 × ( 1 145 - 145 ) =

= 47 × 1 000 =

= 47 000