Question

0,9x+3/4-1,15x при х=3

Answer 1

Если подставить сразу значение в уравнение, то получается
2,7 + 0,75 - 3,45 = 0

Answer 2

3/4=0,75
0,9×3=2,7
0,75+2,7=3,45
3,45-1,15=2,3

Answer 3

To find the value of the expression 0.9x + 3/4 - 1.15x when x = 3, simply substitute the value of x into the expression and perform the calculations:

0.9x + 3/4 - 1.15x

Now, replace x with 3:

0.9 * 3 + 3/4 - 1.15 * 3

Perform the arithmetic:

2.7 + 3/4 - 3.45

Now, to add the fractions, first find a common denominator, which is 4:

2.7 + (3/4)*(4/4) - 3.45

2.7 + 12/4 - 3.45

Next, add the fractions:

2.7 + 3 - 3.45

Now, perform the final subtraction:

2.7 - 0.45

Finally, the result is:

2.25