(-8)*7*0.125*(-3/7) =8x7x0.125x(3/7) =(8x0.125)x(7x(3/7)) =1x3 =3 -100*（3/10-1/2+1/5-0.1） =-100x(3/10-5/10+2/10-1/10) =-100x(-1/10) =10 -10/3*0.73-10/3*0.27 =(-10/3)(0.73+0.27) =(-10/3)(1) =-10/3 （-3/5）*3/5+9/25*（—24） =-9/25-9/25x(24) =(-9/25)(1+24) =(-9/25)x25 =-9