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102 × 98 = (100 + 2)(100 - 2)
= 100² - 2²
= 10.000 - 4
= 9.996
b)
1003 × 97 = (1000 + 3)(100 - 3)
= 100.000 - 3000 + 300 - 9
= 97.291
c)
205² = (200 + 5)²
= 40.000 + 2.000 + 25
= 42.025
d)
389² = (400 - 11)²
= 160.000 - 8.800 + 121
= 151321