-45+(-17)=..,-7+(-12)=..,-140+(-60)=..,-6,4+(-3,6)=..,-5,8+(-1,8)=..,-3,74+(-1,74)=

Let's solve each of the expressions step by step:

1. \(-45 + (-17) = -45 - 17 = -62\)

2. \(-7 + (-12) = -7 - 12 = -19\)

3. \(-140 + (-60) = -140 - 60 = -200\)

4. \(-6.4 + (-3.6) = -6.4 - 3.6 = -10.0\)

5. \(-5.8 + (-1.8) = -5.8 - 1.8 = -7.6\)

6. \(-3.74 + (-1.74) = -3.74 - 1.74 = -5.48\)

So, the final answers are:

1. -62
2. -19
3. -200
4. -10.0
5. -7.6
6. -5.48