25分之4+50分之7
=8/50+7/50
=15/50
=53/10;
12分之7-18分之7
=21/36-14/36
=7/36;
2分之1+5分之1+10分之3
=5/10+2/10+3/10;
=1;
4分之3+18分之11-9分之1
=54/72+44/72-8/72;
=90/72
=5/4;
8分之7-(5分之2+10分之1) 全部要列式.
=7/8-2/5-1/10
=35/40-16/40-4/40
=15/40
=3/8;
如果本题有什么不明白可以追问,
25分之4+50分之7
=8/50+7/50
=15/50
=53/10;
12分之7-18分之7
=21/36-14/36
=7/36;
2分之1+5分之1+10分之3
=5/10+2/10+3/10;
=1;
4分之3+18分之11-9分之1
=54/72+44/72-8/72;
=90/72
=5/4;
8分之7-(5分之2+10分之1) 全部要列式.
=7/8-2/5-1/10
=35/40-16/40-4/40
=15/40
=3/8;
如果本题有什么不明白可以追问,