直接写得数.
×0= ×= ×12= ×= 45×=
9×= ×= ×100= 18×= ×=
+= 18×= ×= 1×= ﹣=
×21= ×= ×6= × ×9=
×= 2﹣=
直接写得数.
×0= ×= ×12= ×= 45×=
9×= ×= ×100= 18×= ×=
+= 18×= ×= 1×= ﹣=
×21= ×= ×6= × ×9=
×= 2﹣=