Sagot :
Réponse:
Bonjour,
x= 5²
y= 1/5
B=x-5y/x
x=25
5y = 5/5
25 - (5/5 )/25
25 - 1/25 = 625/25 -1/25 = 624/25
C=x-5y/x c'est le même que le B
D=(x-5)y/x
(25 - 5)1/5 = 20 *1/5 = 20/5 = 4
4/x = 4/25
bonjour
x = 5²
y = 1/5
B = x - 5 y/x
B = 5² - ( 5 *1/5 : 5²)
= 25 - ( 5/5 x 1/ 25 )
= 25 - 5/125
= 625/25 - 1/25
= 624/25
C = ( 5² - 5*1/5) : 5²
= ( 25 - 5/5 ) : 25
= 24 /25
D = ( x - 5 ) * y/x
= ( 5² - 5 ) * ( 1/5 : 5²)
= ( 25 - 5 ) * ( 1/5 x 1/25 )
= 20 * 1/125
= 20/125 = 4 /25