Question

8.1/2-3.1/2:(2.1/2+1.3/4)•2.3/7=

Answer 1

Ответ:

$6\frac{1}{2}$.

Пошаговое объяснение:

Решение:

$8\frac{1}{2}-3\frac{1}{2}:(2\frac{1}{2}+1\frac{3}{4})*2\frac{3}{7}$

1) $2\frac{1}{2}+1\frac{3}{4}=2\frac{1*2}{2*2}+1\frac{3}{4}=2\frac{2}{4}+1\frac{3}{4}=3\frac{5}{4}$

2) $3\frac{1}{2}:3\frac{5}{4}=\frac{3*2+1}{2}:\frac{3*4+5}{4}=\frac{6+1}{2}:\frac{12+5}{4}=\frac{7}{2}:\frac{17}{4}=\frac{7*4}{2*17}=\frac{28}{34}$

3) $\frac{28}{34}*2\frac{3}{7}=\frac{28}{34}*\frac{2*7+3}{7}=\frac{28}{34}*\frac{14+3}{7}=\frac{28}{34}*\frac{17}{7}=\frac{28*17}{34*7}=\frac{476}{238}$

4) $8\frac{1}{2}-\frac{476}{238}=\frac{8*2+1}{2}-\frac{476}{238}=\frac{16+1}{2}-\frac{476}{238}=\frac{17}{2}-\frac{476}{238}=\frac{17}{2}-\frac{476:119}{238:119}=\frac{17}{2}-\frac{4}{2}=\frac{13}{2}=6\frac{1}{2}$

УДАЧИ! ОБРАЩАЙТЕСЬ!

Answer 2

Решение на фотографии .

Answer 3

To solve the expression, let's break it down step by step:

1. First, let's calculate the expression inside the parentheses: (2.1/2 + 1.3/4) (2.1/2 + 1.3/4) = 1.05 + 0.325 = 1.375

2. Next, let's perform the division: 8.1/2 - 3.1/2 = 4.05 - 1.55 = 2.5

3. Now, let's perform the multiplication: 2.5 * 1.375 = 3.4375

4. Finally, let's perform the last division: 3.4375 ÷ (2.3/7)

To divide by a fraction, we can multiply by its reciprocal. The reciprocal of (2.3/7) is (7/2.3):

3.4375 * (7/2.3) ≈ 3.4375 * 3.04347826087 ≈ 10.4619565217

So, the final result is approximately 10.46196 (rounded to 5 decimal places).