a) 17 - 18 : (5x (-3 + 5 )) = b ) 15 -(2 - ( 1.5 -7 )) = c ) ( 6 - 31 ) : 15 - 3 x 2 svp !!!

bonjour

A) 17 - 18 : (5x (-3 + 5 )
= 17 -18 : ( 5x(+2))
= 17 -18 :10
= 17 -18/10
= 17 -9/5
= 85/5 -9/5
= 76/5

 b ) 15 -(2 - ( 1.5 -7 )
=  15 -(2 -(-5.5))
= 15 -( 2+5.5)
= 15 -(7.5)
= 15-7.5
= 7.5

c ) ( 6 - 31 ) : 15 - 3 x 2
= ( -25) : 15 - 6
= -25/15 -6
= -5/3 -6
= -5/3 -18/3
= -23/3

a) On calacule les parenthese dabord : 17-18 : (5×2).
17-18 : 10.
17-1.8.
a=15.2



b)15-(2-(-5.5)
15-2+5.5 car on a un - devant les parenthese on prend loppose.
13+5.5
18.5



c)-25 : 15-6
-1.6-6
-7.6


c bon.