Question

1) -12+(-8) 2) -7 (-9)13) -5,4+(-3,5)14) -1,68+(-1,68)5) -1름+ (-301) 35+(-24)2) 5+(-8)3) -6,3+(-2,4)4) -2,76+(-2,76)5) -45+ (-19926) - + (-1)7) - + (-)8) -42 + (-2)1) - (-)2) -3 + (-2)​

Answer 1

1)-20
2)63
3)-8,9
4)0
5)-28
6)11
7)-3
8)-8,7
9)0
10)-2037
11)не знаю
12)не знаю
13)-44
14)не знаю
15)-5

Answer 2

Let's solve the arithmetic expressions you provided:

1. -12 + (-8) = -20
2. -7 * (-9) = 63
3. -5.4 + (-3.5) = -8.9
4. -1.68 + (-1.68) = -3.36
5. -1 * (-301) = 301
6. 35 + (-24) = 11
7. 5 + (-8) = -3
8. -6.3 + (-2.4) = -8.7
9. -2.76 + (-2.76) = -5.52
10. -45 + (-19926) = -19971
11. -1 * (-1) = 1
12. • (+) is not a valid expression.
13. -42 + (-2) = -44
14. • (-) is not a valid expression.
15. -3 + (-2) = -5

Note: In expressions involving subtraction, the "-" sign can be interpreted as a negative sign for the number being subtracted.