125×32×25 1/5×7/8+7/8×4/5 86-86×99% 13/29÷8+16/29×1/8=125×8×4×25 =7/8×（1/5+4/5） =86×(1-99%) =13/29×1/8+16/29×1/8=1000×100 =7/8×1 =86×1% =(13/29+16/29)×1/8=100000 =7/8 =0.86 =1×1/8...