Bonjour,

A=

7-130  +(15)*2

= -123 +30 =-93

B=

11 + 2*( -3-21)

= 11+2 * -24

= 11 -48 = -37

C=

-4 +(-2) * (-33,5 - 33,5)

= -4 +(-2) * -67

= -4 +134= 130

-93 -37  +130= -130+130= 0

vrai

Réponse:

vrai.

Explications étape par étape:

A = 7+13x(-10)-5x(-3)x2

= 7+(-130)+30

= -93

B = 11+2x(-3+3x(-7))

= 11+2x(-24)

= 11+(-48)

= -37

C = -5x0,8+(-2)x(-33,5-5x6,7)

= -5x0,8+(-2)x(-67)

= -4+134

= 130

A+B+C = -93+(-37)+130 = 0