(-4又3/17)×(+2又2/15)-8又3/17×14又13/15-4×(-4又13/15)

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(-4又3/17)×(+2又2/15)-8又3/17×14又13/15-4×(-4又13/15)

(-4又3/17)×(+2又2/15)-8又3/17×14又13/15-4×(-4又13/15)
(-4又3/17)×(+2又2/15)-8又3/17×14又13/15-4×(-4又13/15)

(-4又3/17)×(+2又2/15)-8又3/17×14又13/15-4×(-4又13/15)
错了,最后是4×(-14又13/15)
(-4又3/17)×(+2又2/15)-8又3/17×14又13/15-4×(-14又13/15)
=-4又3/17×2又2/15-8又3/17×14又13/15+4×14又13/15
=-4又3/17×2又2/15+(4-8又3/17)×14又13/15
=-4又3/17×2又2/15-4又3/17×14又13/15
=-4又3/17×(2又2/15+14又13/15)
=-(4+3/17)×17
=-(4×17+3/17×17)
=-71