算式:
①30+40+7=
②7+36-9=
③50-(23+7)=
④27-9+6=
⑤65-(45-40)=
⑥33+(15+5)=
⑦43-3-20=
⑧60+39-9=
⑨68-8+30=
3×=24
3×=21
8×=48
1×2=
4×1=
2×4=
2×3=
①95-47=
②81-32-27=
③37+49-46=
④59+28=
⑤43+(36-18)=
⑥92-(30+26)=