24+48+17=2448+721897217++178989244872+1练一练
85–29–48=练一练8529-56。5648-8.852956-.-488.8
5+6–78+9-512-5+814-6+829-9+515+8-3口算
加减混合计算
68-29+51=6829-39.3951+90139.6829-+51901简便算法903
56+24-30=67–34+29=做一做
72-(47+16)=44716+1637263-9.9
32+(55-46)=5546-9+324141
37+(50–26)70-(35+21)85-(32–18)
32+(55–46)=76-(13+42)=做一做
39561825+8-20476426332744613算一算
25+36-47+58-23+19611472496849-25+18-38+78-65244248217夺红旗
64-(17+28)=191728+145-64.1926+(86-59)=538659-.27+26153对不对?
64-(17+28)=191728+14526+(86-59)=538659-.27+261536445-.19对不对?
26+(40-8)70-(23+35)81-52+4865+18–3940+(56–29)36-(78-56)