29/20*99+29/20
=29/20*(99+1)
=29/20*100
=145
6/13*5/12÷5/13
=6/13÷5/13*5/12
=6/5*5/12
=1/2
1-5/8÷25/28-3/10
=1-（7/10+3/10）
=0