(广州)计算下面各题,能简便的尽量简便.
(1)(+
﹣
)÷
(2)[
﹣(
﹣
)]×
(3)20.07×1994﹣19.93×2007
(4)2.5×0.875+0.25×1.25 (5)999+99
+9
+
(6)2.5﹣
﹣
÷
.
(广州)计算下面各题,能简便的尽量简便.
(1)(+
﹣
)÷
(2)[
﹣(
﹣
)]×
(3)20.07×1994﹣19.93×2007
(4)2.5×0.875+0.25×1.25 (5)999+99
+9
+
(6)2.5﹣
﹣
÷
.