1) |-3,5| - |2,6| = 3,5 - 2,6 = 0,9
2) |20/21| + |-5/7| = 20/21 + 5/7 = 20/21 + (5*3)/(7*3) = 20/21 + 15/21 = 35/21 = 5/3 = 1 2/3
3) |-2,1| * |-3,7| = 2,1 * 3,7 = 7,77
4) |1/16| : |-1/4| = 1/16 : 1/4 = 1/16 * 4/1 = 4/16 = 1/4 = 0,25
Ответ:
1) 0,9
2) 1 2/3
3) 7,77
4) 0,25