Question

Calculati respectand ordinea efectuarii operatiilor:
a)93:3+41x5-45:9+28:7+81:3-2x6
b){7+7x[7+3x(5+225:15-15)]}-161
c)10x{2+10x[126+10x(24+24:2-6)]}-42.600

Answer 1

Răspuns:

Explicație pas cu pas:

a)

93 : 3 + 41 × 5 - 45 : 9 + 28 : 7 + 81 : 3 - 2 × 6 = 250

= 31 + 205 - 5 + 4 + 27 - 12 =

= 236 - 5 + 4 + 27 - 12 =

= 231 + 4 + 27 - 12 =

= 262 - 12 =

= 250

b)

{ 7 + 7 × [7 + 3 × (5 + 225 : 15 - 15 ) ] } - 161 = 0

= { 7 + 7 × [7 + 3 × (5 + 15 - 15 ) ] } - 161 =

= { 7 + 7 × [7 + 3 × (20 - 15 ) ] } - 161 =

= [7 + 7 × ( 7 + 3 × 5 )] - 161 =

=  [7 + 7 × ( 7 + 15 )] - 161 =

= ( 7 + 7 × 22 ) - 161 =

= ( 7 + 154 ) - 161 =

= 161 - 161 =

= 0

c)

10 × { 2 + 10 × [126 + 10 × (24 + 24 : 2 - 6)]} - 42 600 = 20

= 10 × { 2 + 10 × [126 + 10 × (24 + 12 - 6)]} - 42 600 =

= 10 × { 2 + 10 × [126 + 10 × ( 36 - 6)]} - 42 600 =

= 10 × [ 2 + 10 × (126 + 10 × 30)] - 42 600 =

= 10 × [ 2 + 10 × (126 + 300)] - 42 600 =

= 10 × ( 2 + 10 × 426 ) - 42 600 =

= 10 × ( 2 + 4 260 ) - 42 600 =

= 10 × 4 262 - 42 600 =

= 42 620 - 42 600 =

= 20