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gul2012
@gul2012
January 2021
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Merci de m'aider au plus vite.
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winner123
Verified answer
Bonsoir
aire trapèze =[ ( 12 + 12 - x) x 5 ]/2
=(120 - 5 x) / 2 = 60 - 2.5 x
aire DOM = 5 x /2 = 2.5 x
2.5 x = ( 60 - 2.5 x) / 5
12.5 x = 60 - 2.5 x
12.5 x + 2.5 x = 60
15 x = 60
x = 4
pour x = 4 , aire DOM est 5 fois plus petite que celle du trapèze
aire trapèze pour x = 4
[( 12 + 8) x 5 ] / 2 = 100 /2 = 50
aire triangle = (4 x 5)/ 2 = 10
et 5 x 10 = 50
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Charles7
5*12=60
60/5=12
Aire triangle = 12cmcarré
12=x*5/2
x=24/5
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Thanks 0
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Verified answer
Bonsoiraire trapèze =[ ( 12 + 12 - x) x 5 ]/2
=(120 - 5 x) / 2 = 60 - 2.5 x
aire DOM = 5 x /2 = 2.5 x
2.5 x = ( 60 - 2.5 x) / 5
12.5 x = 60 - 2.5 x
12.5 x + 2.5 x = 60
15 x = 60
x = 4
pour x = 4 , aire DOM est 5 fois plus petite que celle du trapèze
aire trapèze pour x = 4
[( 12 + 8) x 5 ] / 2 = 100 /2 = 50
aire triangle = (4 x 5)/ 2 = 10
et 5 x 10 = 50
60/5=12
Aire triangle = 12cmcarré
12=x*5/2
x=24/5