Question

VA ROG !!!! DAU COROANA !!!
1) a= -3 +4-6 b=2-8-5 c= 5+8-12
Calculati : a) a-b-c
b) (a-b+c) la puterea 3
2) Puneti parantezele pt a obtine ca rezultat :
7-5x2-3:12= 1
3) Calculati :
a)( -12 + 3) (-5+ 4): (-9)
b) [-6 x (-5 +2) -(-3)]: (-7)

Answer 1

1) a = -3+4-6 = 1-6 = -5
b = 2-8-5 = -6-5 = -11
c = 5+8-12 = 13-12 = 1
a) a-b-c = -5-(-11)-1 = -5+11-1 = 5
b) (a-b+c)^3 = [-5-(-11)+1]^3 =( -5+11+1)^3 =
= 7^3 = 343

2) [7-5×(2-3)] :12 =
= [7-5×(-1)] : 12 =
= (7+5):12 =
= 12 : 12 =
= 1

3)
a) (-12+3)(-5+4):(-9) =
= (-9)×(-1):(-9) =
= 9: (-9) =
= -1

b) [-6×(-5+2)-(-3)] : (-7) =
= [-6×(-3)+3] : (-7) =
= (18+3) : (-7) =
= 21 : (-7) =
= - 3