Помогите с примером. 81/88×(6-1 13/15×1 19/21)

Question

Помогите с примером. 81/88×(6-1 13/15×1 19/21)

Answer 1

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Answer 2

81/88 x (6- 28/15 *40/21)=
81/88x (6- 244/63) =
81/88x134/63 = 9/4= 2 1/4