Ответ:

  1. |−4,2| + 3 = 4,2 + 3 = 7,2.

  2. |−90| : 15 = 90 : 15 = 6.

  3. |7/12| − |−5/12| = 7/12 − 5/12 = 2/12 = 1/6.

  4. |35| + |−8| = 35 + 8 = 43.

  5. |−5/9| · |3/5| = 5/9 · 3/5 = 1/3.

  6. |−100| · |0| = 100 · 0 = 0.