{1}{15}1,3+ 9 4 :(5−4 21 11 )−2 15 1 .

Предыдущий
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вопрос

To simplify the expression, first simplify the terms inside the parentheses:

5 - 4 = 1

Then, continue simplifying the expression:

1/3 + 9/4 / (1 - 2) = 1/3 + 9/4 / -1
= 1/3 + -9/4
= 4/12 - 27/12
= -23/12

Therefore, the answer is -23/12.