Question

0,6*(4х-12)-0,4*(5х*7) при х = 4 1/6

Answer 1

0,6*(4х-12)-0,4*(5x*7) = 2,4x-7,2-14x = -11,6x-7,2 подставляем значение x 
2,4*(25/6)-7,5 = (60/6)-7,5 = 10-7,5=2,5

Answer 2

To evaluate the expression 0.6*(4x-12) - 0.4*(5x*7) with x = 4 1/6, follow these steps:

Step 1: Convert the mixed number x = 4 1/6 into an improper fraction. x = 4 1/6 = (4 * 6 + 1) / 6 = 25 / 6.

Step 2: Substitute the value of x into the expression. 0.6 * (4 * (25 / 6) - 12) - 0.4 * (5 * (25 / 6) * 7)

Step 3: Simplify the expression. 0.6 * (100 / 6 - 12) - 0.4 * (125 / 6 * 7)

Step 4: Continue simplifying. 0.6 * (100 / 6 - 72) - 0.4 * (875 / 6)

Step 5: Further simplification. 0.6 * (28 / 6) - 0.4 * (875 / 6)

Step 6: More simplification. 16.8 / 6 - 350 / 6

Step 7: Final answer. (16.8 - 350) / 6 = -333.2 / 6 ≈ -55.53

So, when x = 4 1/6, the value of the expression 0.6*(4x-12) - 0.4*(5x*7) is approximately -55.53.