30 |
10 |
25 |
一共有多少个?
68-60= | 48-9= | 82-60= |
63-30+9= | 15+70= | 49+8= |
96+4= | 90-30-40= |
①29+48=
②90-55=
③83-36=
④42+23+18=
⑤60-(39+17)=
⑥48+17-26=
①36+27=
②71-38=
③27+53=
④70-35=
⑤21+69=
⑥45-18=
⑦28+19-16=
⑧70-32-8=
⑨25+(40-37)=
①34+29=
②73-27=
③60-30=
④24+28+26=
⑤85-25-30=
⑥86-(15+16)=
有27节电池,10节装一盒,能装满几盒?若全部装完,需要几个盒子?