bonjour
A = 1005² = (1000+5)² = 1000²+ 2*5*1000 + 5² = 1000 000 + 10 000 + 25
= 1 010 025
B=49² = (50-1)² = 50² - 2*50*1 + 1² = 2500 - 100 + 1 = 2 401
D=107*93 = (100+7) (100-7) = 100² - 7² = 10 000 - 49 = 9 951
:)
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bonjour
A = 1005² = (1000+5)² = 1000²+ 2*5*1000 + 5² = 1000 000 + 10 000 + 25
= 1 010 025
B=49² = (50-1)² = 50² - 2*50*1 + 1² = 2500 - 100 + 1 = 2 401
D=107*93 = (100+7) (100-7) = 100² - 7² = 10 000 - 49 = 9 951
:)