bonsoir
( 2 x + 5 ) ( 2 x - 5 )
= 4 x² - 25
205 x 195 = ( 200 + 5 ) ( 200 - 5 ) = 200² - 5 ² = 39 975
BC = 36 m
BJ/BN = BA/BC = JA/NC
60/36 = 45/NC
NC = 27 m
BN² = 27² + 36 ²
BN² = 2025
BN = √2025 = 45
JB² = 45² + 60 ²
JB² = 5625
jB = √5625 = 75
il devra parcourir 45 + 75 = 120 m
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bonsoir
( 2 x + 5 ) ( 2 x - 5 )
= 4 x² - 25
205 x 195 = ( 200 + 5 ) ( 200 - 5 ) = 200² - 5 ² = 39 975
BC = 36 m
BJ/BN = BA/BC = JA/NC
60/36 = 45/NC
NC = 27 m
BN² = 27² + 36 ²
BN² = 2025
BN = √2025 = 45
JB² = 45² + 60 ²
JB² = 5625
jB = √5625 = 75
il devra parcourir 45 + 75 = 120 m