Question

А) ( 5/7-2/3y)*21=1 б) 2/3x+7/3x=18 г) 7/12m+2/3m-1/4m=7 РЕШИТЕ ПОЖАЛУЙСТА СРОЧНО!!!! ЗАРАНЕЕ СПАСИБО!!!!!!!!

Answer 1

А) (5/7-2/3 у)*21=1
15-14 у=1
-14 у=-14
у=1
Ответ:1
б)2/3 х+7/3 х=18
9/3 х=18
х=18: 9/3
х=6
Ответ:6
г)7/12m+2/3m-1/4m=7
1m=7
m=7
Ответ:7

Answer 2

a) (+5/7 - 2/3y) * 21 = 1

To solve the equation (+5/7 - 2/3y) * 21 = 1, we can follow these steps:

1. Distribute the 21 to both terms inside the parentheses: (+5/7 * 21 - 2/3y * 21) = 1

2. Simplify the expression: (105/7 - 42/3y) = 1

3. Convert the fractions to a common denominator: (105/7 - 42/3y) = 1 (105/7 - 14/1y) = 1

4. Multiply the fractions by their respective denominators to eliminate the denominators: (105 - 98y) = 7

5. Simplify the equation: 105 - 98y = 7

6. Solve for y: Subtract 105 from both sides: -98y = 7 - 105 -98y = -98

Divide both sides by -98: y = -98 / -98 y = 1

Therefore, the solution to the equation (+5/7 - 2/3y) * 21 = 1 is y = 1.