bjr
ex 1
tu es face à un triangle rectangle CDE rectangle en D - tu appliques pythagore :
CE² = DC² + DE²
tu peux finir :)
ex 3
45 km ........... 30 min
x km ................ 60 min (1h)
x * 30 = 45 * 60
x = 45*60/30 = 90 km/h
x km ................45 min
x*30 = 45*45
x = 45*45/30 = 67,50 km en 45 min
18 km ...............x min
tu as compris ..
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bjr
ex 1
tu es face à un triangle rectangle CDE rectangle en D - tu appliques pythagore :
CE² = DC² + DE²
tu peux finir :)
ex 3
45 km ........... 30 min
x km ................ 60 min (1h)
x * 30 = 45 * 60
x = 45*60/30 = 90 km/h
45 km ........... 30 min
x km ................45 min
x*30 = 45*45
x = 45*45/30 = 67,50 km en 45 min
45 km ........... 30 min
18 km ...............x min
tu as compris ..