Resuelve las siguientes restas y obtén el resultado correcto:

1) [tex]6.9 - 3.4[/tex]
2) [tex]7.8 - 4 \cdot 6[/tex]
3) [tex]4.6 - 3.5[/tex]
4) [tex]12.5 - 11.4[/tex]
5) [tex]45.6 - 24.4[/tex]
6) [tex]78.9 - 45.6[/tex]
7) [tex]56.9 - 35.9[/tex]
8) [tex]83.8 - 72.4[/tex]
9) [tex]64.8 - 42.7[/tex]
10) [tex]55.6 - 11.5[/tex]
11) [tex]89.7 - 77.7[/tex]
12) [tex]63.7 - 22.5[/tex]

Sure! Let's solve each subtraction step by step:

1) Calculate [tex]\(6.9 - 3.4\)[/tex]:
[tex]\(6.9 - 3.4 = 3.5\)[/tex]

2) Calculate [tex]\(7.8 - 4 \cdot 6\)[/tex]:
First, perform the multiplication because of the order of operations:
[tex]\(4 \cdot 6 = 24\)[/tex]
Then, subtract:
[tex]\(7.8 - 24 = -16.2\)[/tex]

3) Calculate [tex]\(4.6 - 3.5\)[/tex]:
[tex]\(4.6 - 3.5 = 1.1\)[/tex]

4) Calculate [tex]\(12.5 - 11.4\)[/tex]:
[tex]\(12.5 - 11.4 = 1.1\)[/tex]

5) Calculate [tex]\(45.6 - 24.4\)[/tex]:
[tex]\(45.6 - 24.4 = 21.2\)[/tex]

6) Calculate [tex]\(78.9 - 45.6\)[/tex]:
[tex]\(78.9 - 45.6 = 33.3\)[/tex]

7) Calculate [tex]\(56.9 - 35.9\)[/tex]:
[tex]\(56.9 - 35.9 = 21.0\)[/tex]

8) Calculate [tex]\(83.8 - 72.4\)[/tex]:
[tex]\(83.8 - 72.4 = 11.4\)[/tex]

9) Calculate [tex]\(64.8 - 42.7\)[/tex]:
[tex]\(64.8 - 42.7 = 22.1\)[/tex]

10) Calculate [tex]\(55.6 - 11.5\)[/tex]:
[tex]\(55.6 - 11.5 = 44.1\)[/tex]

11) Calculate [tex]\(89.7 - 77.7\)[/tex]:
[tex]\(89.7 - 77.7 = 12.0\)[/tex]

12) Calculate [tex]\(63.7 - 22.5\)[/tex]:
[tex]\(63.7 - 22.5 = 41.2\)[/tex]

These are the solved results for each subtraction! Let me know if you need further explanation or assistance with anything else.