Question

Помогите пож. решить пример 30-23.1:(5 7/20 - 4 6/35)=

Answer 1

1)5 7\20-4 6\35=1+(7*7\140-6*4\140)=1+25\140=1 5\28
2)23,1:1 5\28=231/10*28/33=98\5=19.6
3)30-19.6=10.4
ответ:10.4

Answer 2

To solve the expression 30 - 23.1 ÷ (5 + 7/20 - 4 + 6/35), we need to follow the order of operations, also known as PEMDAS (Parentheses, Exponents, Multiplication and Division, and Addition and Subtraction).

Let's break down the expression step by step:

1. Simplify the expression inside the parentheses: 5 + 7/20 - 4 + 6/35 = 5 + 0.35 - 4 + 0.17 = 5.52 - 4.17

2. Perform the subtraction inside the parentheses: 5.52 - 4.17 = 1.35

3. Now, substitute the simplified expression back into the original expression: 30 - 23.1 ÷ 1.35

4. Perform the division: 23.1 ÷ 1.35 = 17.1111111111 (rounded to 10 decimal places)

5. Finally, subtract the result from step 4 from 30: 30 - 17.1111111111 = 12.8888888889 (rounded to 10 decimal places)

Therefore, the solution to the expression 30 - 23.1 ÷ (5 + 7/20 - 4 + 6/35) is approximately 12.8888888889.