Oblicz korzystajac ze wzorów skrócnego mnożenia : e) 95x105 f)993x1007 g) 508 x 492poczebuje na dzisaj
e) 95*105 = (100-5)(100+5) = 100²-5² = 10000-25 = 9975
f) 993*1007 = (1000-7)(1000+7) = 1000²-7² = 1000000-49 = 999951
g) 508*492 = (500+8)(500-8) = 500²-8² = 250000-64 = 249936
Korzystamy z wzoru:
(a+b)(a-b) = a²-b²
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e) 95*105 = (100-5)(100+5) = 100²-5² = 10000-25 = 9975
f) 993*1007 = (1000-7)(1000+7) = 1000²-7² = 1000000-49 = 999951
g) 508*492 = (500+8)(500-8) = 500²-8² = 250000-64 = 249936
Korzystamy z wzoru:
(a+b)(a-b) = a²-b²