-3/4+2/3;1/8-5/6;-12×2/3;-2.4/-0.6

-3/4+2/3 = -9/12 + 8/12 = -1/12;1/8-5/6 = 3/24 - 20/24 = -17/24;-12×2/3 = -4*2=-8;-2.4/-0.6 = -24/10 : 6/10 = -24/10 * 10/6 = -4