Question

Calculati:
a)  [2*(x+2)*5+3*(x+2)]*7=273
b)  2004+2004*2005-2003*2006

Answer 1

Răspuns:

Explicație pas cu pas:

a)

[2 × ( X + 2 ) × 5 + 3 × ( X + 2 ) ] × 7 = 273

10 x + 20 + 3 x + 6 = 273 : 7

13 x + 26 = 39

13 x = 39 - 26

13 x = 13

x = 13 : 13

x = 1

___________________

b)

2004 + 2004 × 2005 - 2003 × 2006 =  2006

= 2004 × ( 1 + 2005 ) - 2003 × 2006 =

= 2004 × 2006 - 2003 × 2006 =

= 2006 × ( 2004 - 2003 ) =

= 2006 × 1 =

= 2006