Question

7|-x|-4|3y-3,4| при x =-2,y=0,8

Answer 1

7*|-(-2)|-4*|3*0.8-3,4|
7*|2|-4*|2,4-3,4|
7*2-4*|-1|
14-4*1=10

Answer 2

To evaluate the expression 7|-x|-4|3y-3| when x = -2 and y = 0.8, we substitute the given values into the expression and calculate step by step:

Step 1: Substitute x = -2 and y = 0.8 into the expression. 7|-(-2)| - 4|3(0.8) - 3|

Step 2: Simplify the absolute value inside the first pair of brackets. 7|2| - 4|3(0.8) - 3|

Step 3: Calculate the absolute value inside the first pair of brackets. 7 * 2 - 4|3(0.8) - 3|

Step 4: Perform the multiplication. 14 - 4|2.4 - 3|

Step 5: Calculate the absolute value inside the second pair of brackets. 14 - 4|0.6|

Step 6: Calculate the absolute value. 14 - 4 * 0.6

Step 7: Perform the multiplication. 14 - 2.4

Step 8: Subtract the result. 11.6

So, when x = -2 and y = 0.8, the expression 7|-x|-4|3y-3| evaluates to 11.6.