Question

(-18-21)+(-15+4) (-25+15)-(-13-12) (0,8-1,4)+(1,2-1,6) (-2,1+5,3)-(4,7-6,8)

Answer 1

-39+(-11)=-39-11=-50

-10-(-25)=-10+25=15

-0.6+(-0.4)=-0.6-0.4=-1

3.2-(-2.1)=3.2+2.1=5.3

Answer 2

Let's simplify each of the given expressions:

1. (-18 - 21) + (-15 + 4): = -39 + (-11) = -39 - 11 = -50

2. (-25 + 15) - (-13 - 12): = -10 - (-25) = -10 + 25 = 15

3. (0.8 - 1.4) + (1.2 - 1.6): = -0.6 + (-0.4) = -0.6 - 0.4 = -1.0

4. (-2.1 + 5.3) - (4.7 - 6.8): = 3.2 - (-2.1) = 3.2 + 2.1 = 5.3

Therefore, the simplified values for the given expressions are:

1. (-18 - 21) + (-15 + 4) = -50
2. (-25 + 15) - (-13 - 12) = 15
3. (0.8 - 1.4) + (1.2 - 1.6) = -1.0
4. (-2.1 + 5.3) - (4.7 - 6.8) = 5.3