Răspuns:
a. 70
b. 2
c. 6
d. 2200
Explicație pas cu pas:
a. 7 × 13 - 7 × 3 = 7 × (13 - 3) = 7 × 10 = 70
b. 2008 × 2009 - 2006 × 2009 - 2 × 2008 = 2009 × (2008 - 2006) - 2 × 2008 = 2009 × 2 - 2 × 2008 = 4018 - 4016 = 2
c. 96 × 94 - 96 × 92 - 2 × 93 = 96 × (94 - 92) - 2 × 93 = 96 × 2 - 2 × 93 = 192 - 186 = 6
d. (5 + 17) × (31 + 27) + (5 + 17) × (19 + 23) = 22 × 58 + 22 × 42 = 1276 + 924 = 2200
