下列各题，能简算的必须简算．46× ﹣（﹣）÷ 90×÷[（﹣）×] ÷23+× ×+×0.6．
直接写得数.﹣=+= 3﹣=+=
请选择合适的方法计算下面各题． 1﹣﹣﹣+++﹣﹣+﹣．
直接写出得数： ①= ②= ③= ④= ⑤= ⑥= ⑦= ⑧=
直接写得数．+=+=+=﹣=+= 0.4+=﹣=﹣=+=+=
直接写出得数．= 5﹣== 0.5×0.5÷5==﹣== 0.4×25﹣10==﹣= 1+==
﹣（
﹣
）÷
90×
÷[（
﹣
）×
] 
÷23+
×
×
+
×0.6．
﹣
=
+
= 3﹣
=
+
=
﹣
﹣
+
+
+
﹣
﹣
+
﹣
．
= ②
= ③
= ④
=
= ⑥
= ⑦
= ⑧
=
+
=
+
+
=
﹣
=
+
=
=
﹣
=
﹣
=
+
=
=
= 5﹣
=
= 0.5×0.5÷5=
=
﹣
=
= 0.4×25﹣10=
=
﹣
=
=
=
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