如题所述
第1个回答 2020-07-02
4/15+(3/4-2/5)=4/15-2/5+3/4
=(4-2*3)/15+3/4=-2/15+3/4
=(-2*4+3*15)/4*15=37/60
=(4-2*3)/15+3/4=-2/15+3/4
=(-2*4+3*15)/4*15=37/60
第2个回答 2020-07-02
4/15+(3/4-2/5)
=4/15+3/4-2/5
=4/15-6/15+3/4
=-2/15+3/4
=-8/60+45/60
=37/60本回答被网友采纳
=4/15+3/4-2/5
=4/15-6/15+3/4
=-2/15+3/4
=-8/60+45/60
=37/60本回答被网友采纳
第3个回答 2020-07-02
4/15+(3/4-2/5)
=4/15-2/5+3/4
=4/15-6/15+3/4
=3/4-2/15
=45/60-8/60
=37/60
=4/15-2/5+3/4
=4/15-6/15+3/4
=3/4-2/15
=45/60-8/60
=37/60