①39+36+8=
②98-36-47=
③100-9-28=
④76-57+32=
⑤58+24-49=
⑥56-(9+38)=
①58+27=
②72-43=
③38+46=
④62-28=
4×8=
67-40=
84-29=
40-19-19=
5×7=
30+34=
5+35=
60-(19-16)=
8-2=
3×4=
4×5+15=
35+53-19=
口诀:
①27+38+12
②83-46-24
③43+(56-24)
④85-(43-28)
64-50-4=
79-(20+50)=
9+(56-8)=