Question

EVALUARE
1. Calculează, respectând ordinea efectuării operațiilor:
a) [1 + (5 x 7 - 2 x 15)] : 2 x (2 x 8 - 15): [3 : (1 + 14 : 7) + 2] =
b) 98 + 8 x [1 004 - 4 x (8: 2 x 2 - 4:4 x 2)]
c) [1 + 2 x (6 + 6:3) - 5]: 6 =​

Answer 1

Răspuns:

a) [1+(5×7-2×15)]÷2×(2×8-15)÷[3÷(1+14÷7)+2]

=[1+(35-30)]÷2×(16-15)÷[3÷(1+2)+2]

=(1+5)÷2×1÷(3÷3+2)

=6÷2÷(1+2)

=3÷3

=1

b)98+8×[1004-4×(8÷2×2-4÷4×2)]

=98+8×[1004-4×(4×2-1×2)]

=98+8×[1004-4×(8-2)]

=98+8×(1004-4×6)

=98+8×(1004-20)

=98+8×984

=98+7872

=7970

c)[1+2×(6+6÷3)-5]÷6

=[1+2×(6+2)-5]÷6

=(1+2×8-5)÷6

=(1+16-5)÷6

=(17-5)÷6

=12÷6

=2

Sper că te-am ajutat!