Respostas

2013-07-11T21:08:27-03:00
A) (60+2) (60-2) = 60² - 2² = 3600 - 4= 3596
B) (40+4) (40-4) = 40² - 4² = 1600-16= 1584
C) (50+1) (50-1) = 50² - 1² = 2500-1 = 2499
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