Question

12х-у , если х=5 3/4 у=7/12

Answer 1

12*х - у , если х= 5 3/4 , у= 7/12
12* 5 3/4 - 7/12= (12*23)/ (1 *4)   -   7/12 =
 =(3*23)/(1*1)   -  7/12= 69  -  7/12 = 68 5/12

Answer 2

To evaluate the expression 12x - y when x = 5 3/4 and y = 7/12, we substitute the given values into the expression:

12(5 3/4) - (7/12)

To simplify this expression, we first convert the mixed number 5 3/4 to an improper fraction:

5 3/4 = (4 * 5 + 3) / 4 = 23/4

Now, we can substitute the values:

12(23/4) - (7/12)

To multiply a fraction by a whole number, we multiply the numerator by the whole number and keep the same denominator:

= (12 * 23)/4 - (7/12)

= 276/4 - 7/12

To subtract fractions, we need a common denominator. In this case, the common denominator is 12:

= (276 - 7 * 3)/(4 * 3)

= (276 - 21)/12

= 255/12

This fraction can be simplified by dividing both the numerator and denominator by their greatest common divisor, which is 3:

= (255/3) / (12/3)

= 85/4

Therefore, when x = 5 3/4 and y = 7/12, the expression 12x - y is equal to 85/4.