Question

2- 3 1/7×[2-1 9/11]÷8/21 Задание: Вычислите.

Answer 1

2-$2-\frac{31*2*21}{11*7*8} = \frac{31*3}{11*4} = \frac{93}{44}=2 \frac{5}{44}$
ответ равен: 5/44

Answer 2

2-3+1/7×[2-1+9/11]÷8/21

First, let's simplify the expression inside the brackets: 2-1 = 1 9/11 = 9/11

Now, we can substitute these values back into the original expression: 2-3+1/7×(1+9/11)÷8/21

Next, let's simplify the expression inside the parentheses: 1+9/11 = 11/11 + 9/11 = 20/11

Now, we can substitute this value back into the original expression: 2-3+1/7×(20/11)÷8/21

Next, let's simplify the multiplication and division within the brackets: 1/7×(20/11) = 20/77 20/77 ÷ 8/21 = 20/77 × 21/8 = 210/616 = 105/308

Now, we can substitute this value back into the original expression: 2-3+105/308

Finally, let's add and subtract the numbers: 2-3 = -1 -1 + 105/308 = -308/308 + 105/308 = -203/308

So the final answer is -203/308.