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4,48² - 5² - ( 4,48 - 5 ) · ( 4,48 + 5 ) =

Răspuns :

-54,48 ! E usor:
4,48x4,48=20, 0704
5x5=25
20, 0704-25=4,9296
4,48-5=0,52
4,9296-0,52=4,4096
4,4096x9,48=-54,48