(2 2/21 : 1. 5/7 -11 ) : 9,9 - 1/81 =

Question

(2 2/21 : 1. 5/7 -11 ) : 9,9 - 1/81 =

Comments

= -1

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Спасиба

Answer 1

(2 2/21 : 1 5/7 -11) : 9,9 -1/81=79/81

1) 2 2/21 : 1 5/7= 44/21 : 12/7= 44/21*7/12= 44*7 / 21*12= 44 / 3*12= 11 / 3*3= 11/9
2) 11/9-11=11/9-99/9= -88/9
4) 88/9:9,9= 88/9 : 99/10= 88/9*10/99= 88*10 / 9*99= 8*10 / 9*9= -80/81
5) -80/81-1/81= -81/81= -1

Comments

2) 11/9-11=11/9-99/9= -88/9
4) -88/9:9,9= -88/9 : 99/10= -88/9*10/99= -88*10 / 9*99= -8*10 / 9*9= -80/81
5) -80/81-1/81= -81/81 = -1

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спасибо

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здесь тоже исправь (2 2/21 : 1 5/7 -11) : 9,9 -1/81=79/81