(1/2+11/12+3/4+5/6)*(-5)+(-756):(-36) = (6/12+11/12+9/12+10/12)*(-5)+21 =
<span>1) -1= |-1| = 1</span>
<span>2)6/19 = | 6/19| = 6/19</span>
<span>3) -0.4 = |-0,4|= 0,4</span>