第三题??
2017-02-17
展开全部
2/3-7/10+1/3
=1-7/10=3/10
7/8-(3/5+2/15)
=7/8-11/15
=105/120-88/120
=17/120
1-3/7-4/7
=1-(3/7+4/7)
=1-1=0
=1-7/10=3/10
7/8-(3/5+2/15)
=7/8-11/15
=105/120-88/120
=17/120
1-3/7-4/7
=1-(3/7+4/7)
=1-1=0
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