计算:(1)238÷238;(2)(9+7)÷(+).
直接写出得数.3= = = 0.3×0.2=5﹣= = = 4﹣()=
请选择合适的方法计算下面各题.﹣ + 1﹣﹣ ﹣+++ ﹣﹣ +﹣.
下面各题,怎样算简便就怎样算.①++ ②1﹣﹣ ③+﹣.
直接写出得数.= = = == = = =
口算.= = = =