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Efectuiaza : { 20 - 10 × ( 211 - 7 × ( 24 + 24 ÷ 4 )]} ÷ 10 - 1

Răspuns :

{20-10×(211-7×30)]:10-1={20-10×(211-210)}:10-1={20-10×1}={20-10}:10-1=10:10-1=1-1=0
{ 20 - 10 × ( 211 - 7 × ( 24 + 24 ÷ 4 )]} ÷ 10 - 1 =

{ 20 - 10 × [ 211 - 7 × ( 24 + 6 )]} ÷ 10 - 1 =

{ 20 - 10 × ( 211 - 7 ×30)} ÷ 10 - 1 =

[ 20 - 10 × ( 211 -210)] ÷ 10 - 1 =

(20 - 10 × 1) ÷ 10 - 1 =

(20 - 10) : 10 - 1 =

10 :10 - 1=

1 -1 = 0