Question

2,3+(-5,1) 5,4-(-2,7) 12целых 7/22-(-1целых 5/33) 4.9-5 целых 3/4-2целых 7/8-(-1целых 3/16) уравнение! 4 целых 7/9-(x+2.9)=7целых 5/18 спасибо зарание ЛАФКИ ЧМАФКИИ) даю 20 баллов

Answer 1

1)-2,8
2)8,1
3)13целых 31/66
4)3/8
X+2,9=-2целых 1/2
X=-5,4.
Вроде бы так

Answer 2

Let's solve each expression step by step:

1. 2.3 + (-5.1) = -2.8

2. 5.4 - (-2.7) = 8.1

3. 12 целых 7/22 - (-1 целых 5/33) = 12 - 1 + 7/22 + 5/33 To perform the addition, you need a common denominator. The least common multiple of 22 and 33 is 66. Therefore, (7/22)(3/3) = 21/66, and (5/33)(2/2) = 10/66. Now the expression becomes: 12 - 1 + 21/66 + 10/66 = 11 + 31/66.

4. 4.9 - 5 целых 3/4 - 2 целых 7/8 - (-1 целых 3/16) We need to convert the mixed fractions into improper fractions: 5 целых 3/4 = 54 + 3/4 = 20 + 3/4 = 20 + 0.75 = 20.75 2 целых 7/8 = 28 + 7/8 = 16 + 7/8 = 16 + 0.875 = 16.875

   • (-1 целых 3/16) = 1*16 + 3/16 = 16 + 3/16 = 16.1875 Now the expression becomes: 4.9 - 20.75 - 16.875 - 16.1875 = -48.9125

5. 7 целых 5/18 = 7*18 + 5/18 = 126 + 5/18 = 126 + 0.277777... ≈ 126.28

Now, let's solve the equation:

6. 4 целых 7/9 - (x + 2.9) = 7 целых 5/18

First, convert the mixed fractions into improper fractions: 4 целых 7/9 = 49 + 7/9 = 36 + 7/9 = 36 + 0.777777... ≈ 36.78 7 целых 5/18 = 718 + 5/18 = 126 + 5/18 = 126 + 0.277777... ≈ 126.28

Now the equation becomes: 36.78 - (x + 2.9) = 126.28

Next, isolate the variable (x) on one side of the equation:

36.78 - 126.28 = x + 2.9

-89.5 = x + 2.9

Now, solve for x:

x = -89.5 - 2.9

x ≈ -92.4

So, the value of x is approximately -92.4.

Thank you for the 20 points! If you have any more questions or need further assistance, feel free to ask. ЛАФКИ and ЧМАФКИИ to you too! :)