分解因式：1.25*14^2-125*8.6^2

1.25*14^2-125*8.6^2
=1.25*14^2-1.25*10^2*8.6^2
=1.25*14^2-1.25*86^2
=1.25[14^2-86^2]
=1.25[14+86][14-86]
=1.25*100*[-72]
=125*[-9]*8
=1000*[-9]
=-9000