26-(14+6-5)+(-8+7) 10[8-17+3-(9-20)] Aidez moi svp

Bonjour

26-(14+6-5)+(-8+7) =

26-14-6+5-8+7 = 10

10[8-17+3-(9-20)]=

10 ( 8-17+3-9+20)=

10* 5 = 50

Règle des signes:

-(-) => +

-(+) => -

+(-) => -

+(+) => +

26-(14+6-5)+(-8+7)

=26-(14+1)-1

=26-15-1

=26-16

=10

10[8-17+3-(9-20)]

=10[-9+3-(-11)]

=10(-9+3+11)

=10(-6+11)

=10(+5)

=10×5

=50