文档介绍：5×=
×=
×=
×0=
10×=
×7=
×100=
×4=
×4=
4×=
×8=
×4=
×0=
×50=
30×=
×3=
×2=
×=
×=
1-=
×=
÷=
0×=
+=
+=
×=
4÷=
3÷4=
÷9=
×4=
6-=
+=
×4=
×0=
0÷=
×=
1×=
9×=
×8=
×3=
×2=
×=
×=
×=
1×=
9×=
×8=
×=
+=
100-=
×=
×5=
×4=
-=
×1=
0×=
÷5=
÷17=
÷=
÷=
×4÷(6+3)
×〔-(+)〕
+×4)÷5
×25×+
2÷+÷2
5180-705×6
÷4=
÷13=
÷5=
+=
10÷20=
24÷15=
×10=
×=
+=
-=
×=
×1000=
×=
×=
÷=
÷9=
÷=
÷2=
÷=
÷=
÷=
×4=
×=
÷=
×=
×=
×=
÷=
×100=
×8=
1÷=
×=
÷=
0÷=
×102=
÷=
5×=
-=
÷=
÷=
×=
+=
÷=
5÷=
÷=
÷=
÷5=
7×=
5×=
24×=
÷=
-=
÷=
÷8=
×=
8+=
×30=
×=
×=
0÷6=
(80÷20+80)÷4
--
+-+
(-)÷
+++
--(+)
100-=
÷5=
+5=
÷=
÷