1)-3,5+8,1=4,6
-2,9-3,6 = -6,5
-7,5+2,8=-4,7
-5/6+3/8 = -20/24 + 9/24 = -11/24
-2a5/7 - 1a3/14 = -19/7 - 17/14 = -38/14 -17/14 = - 55/14
2)(6/35 - 20/35) - (-6,1)-5,7 = (-14/35)+6,1 - 5,7 = -2/5 + 0,4 = 0
3)5,23 +x=-7,24, x = -7,24 - 5,23 , x= -12,4
y-(2a5/12)= -(3a7/15), y = -52/15 + 29/12,y = -208/60 + 145/60,y=-63/60
y=-21/20
4)C(-4,7),D(-0,8), /CD/ = -0,8- ( -4,7)=-0,8+4,7=3,9
5)3,4,5,6, -3,-4,-5,-6