=
0.7-0.7×0.7=
0.75+=
2.3×0.4÷2.3×0.4=
①
②
③0.01÷1=
④52×198≈
⑤
⑥
⑦
⑧23=
+=
-=
1-=
8--=
8×1.25=
+==
-=-=