Question

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

Answer 1

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

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

=-10/13+14/13

=4/13

（3/7-5/9+8/21）*63-7.15*5+3.15*5

=3/7*63-5/9*63+8/21*63-(7.15-3.15)*5

=27-35+24-20

=-4