Question

1) -250+120 2) -640+800 3) 0,35+(-0,35) 4)-3 1/7 +3 1/7 5) 1,7 + (−4) 6) 1,9 + (−5) 7) 7/15 + (- 11/15 ) 8) 9+(-1 / 2 )

Answer 1

Ответ:

1)-130

2)160

3)0

4)0

5)-2.3

6)-3.1

7)-4/15 сорри если не правильно сейчас ночь и я хочу спать

8)8.5

Answer 2

Sure, I'd be happy to help you with these calculations:

1. -250 + 120 = -130
2. -640 + 800 = 160
3. 0.35 + (-0.35) = 0 (when you add a number to its negative counterpart, the result is always 0)
4. -3 1/7 + 3 1/7 = 0 (the fractions have the same absolute value, so they cancel out)
5. 1.7 + (-4) = -2.3
6. 1.9 + (-5) = -3.1
7. 7/15 + (-11/15) = -4/15
8. 9 + (-1/2) = 17/2 or 8.5