Question

Вычислить значение выражения: а) 3217-51; 204.405; 6) (643-479)-3600. в) Во вторник музей посетили 530 человек, что в 3 раза меньше, чем в понедельник, и на 45 человек больше, чем в среду. Сколько чело- век побывало в музее на протяжении этих трех дней? (Составить и вычис- лить выражение.) 2. Вычислить наиболее удобным способом: а) 514.20; 8.49.125; 6) 417.187+213.417; B) 52-187-52.43-144.42. 3. Упростить выражение: а) 15-2x; 3х+7x; ) б) c+72с -13; в) 17х-8x+x-18 и вычислить его значение, если х = 312. Помогите срочно ​

Answer 1

Ответ:

Пошаговое объяснение:

1

а) 3.166 б) 34.065,5 в) 3.436

2

530+(530*3-45) =2.075(наверное так)

Остальные скажу потом)))

Answer 2

Calculating Expressions

a) To calculate the value of the expression 3217 - 51; 204.405; 6) (643 - 479) - 3600, we can follow the order of operations (PEMDAS/BODMAS) and simplify it step by step:

1. Evaluate the expression within the parentheses: 643 - 479 = 164. 2. Replace the expression within the parentheses with the result: 3217 - 51; 204.405; 6) 164 - 3600. 3. Evaluate the expression within the parentheses again: 3217 - 51 = 3166. 4. Replace the expression within the parentheses with the result: 3166; 204.405; 6) 164 - 3600. 5. Evaluate the expression within the parentheses one more time: 3166; 204.405; 6) 164 = 164. 6. Replace the expression within the parentheses with the result: 3166; 204.405; 164 - 3600. 7. Finally, evaluate the remaining expression: 3166 - 3600 = -434.

Therefore, the value of the expression is -434.

b) To calculate the value of the expression 514.20; 8.49.125; 6) 417.187 213.417, we can follow the order of operations:

1. Evaluate the expression within the parentheses: 8.49.125 = 8.49 * 125 = 1061.25. 2. Replace the expression within the parentheses with the result: 514.20; 1061.25; 6) 417.187 213.417. 3. Evaluate the expression within the parentheses: 514.20; 1061.25; 6) 417.187 = 417.187. 4. Replace the expression within the parentheses with the result: 417.187 213.417. 5. Finally, evaluate the remaining expression: 417.187 - 213.417 = 203.77.

Therefore, the value of the expression is 203.77.

c) To calculate the value of the expression 52 - 187 - 52.43 - 144.42, we can simply perform the subtraction operations from left to right:

1. Subtract 187 from 52: 52 - 187 = -135. 2. Subtract 52.43 from the previous result: -135 - 52.43 = -187.43. 3. Subtract 144.42 from the previous result: -187.43 - 144.42 = -331.85.

Therefore, the value of the expression is -331.85.

Museum Visitors

In order to determine the number of visitors to the museum over the course of three days, we need to analyze the given information.

On Tuesday, the museum was visited by 530 people, which is 3 times less than the number of visitors on Monday. Additionally, the number of visitors on Tuesday is 45 more than the number of visitors on Wednesday.

Let's denote the number of visitors on Monday as x. Based on the given information, we can set up the following equation:

530 = x / 3 - 45

To solve for x, we can rearrange the equation:

x / 3 = 530 + 45

x / 3 = 575

Multiplying both sides of the equation by 3, we get:

x = 1725

Therefore, the number of visitors to the museum over the course of these three days is 1725 + 530 + (530 + 45) = 2830.

Simplifying Expressions

a) To simplify the expression 15 - 2x + 3x + 7x, we can combine like terms:

15 - 2x + 3x + 7x = 15 + 8x

b) To simplify the expression c + 72c - 13, we can combine like terms:

c + 72c - 13 = 73c - 13

c) To simplify the expression 17x - 8x + x - 18, we can combine like terms:

17x - 8x + x - 18 = 10x - 18

To calculate the value of this expression when x = 312, we substitute x with 312:

10(312) - 18 = 3120 - 18 = 3102

Therefore, when x = 312, the value of the expression is 3102.