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550:10+20×(81:9+9)-20:(6×7-11×2)

Răspuns :

550:10+20x(9+9)-20:(42-22)=
550:10+20x18-20:20=
55+360-1=415-1=414
550÷10+20×(81÷9+9)-20÷(6×7-11×2)=
550÷10+20×(9+9)-20÷(42-22)=
550÷10+20×18-20÷20=
550÷10+360-1=
55+360-1=
415-1=414
sucees