1、(-5)*3/13+(-5)*(-2/13)-5*1/13+0.125*(-14/13)*(-8)

(-5)*3/13+(-5)*(-2/13)-5*1/13+0.125*(-14/13)*(-8)

=(-5)(3/13-2/13+1/13)+14/13
=-10/13+14/13
=4/13
（3/7-5/9+8/21）*63-7.15*5+3.15*5
=27-35+24-5(7.15-3.15)
=16-20
=-4