+=
63=
2.95×1000=
-=
+0.5=
1.25×0.8×0=
2--=
6.12+2.88=
-+=
÷ =
× =
1﹣ =
×6=
15÷ =
﹣ =
+ =
①x﹣ x=15
② x÷ =
③ x+ x=
列式:
口诀: