一个长方体的棱长和为60cm，已知长、宽、高的比是3：2：1，求长方体的体积与表面积各是多少？
直接写得数．+=+=﹣= 1﹣=﹣= 0.25+=+= 2+=+=﹣=
脱式计算，能简算的要简算． 3﹣﹣++﹣+﹣．
①+=②+=③﹣= ④2﹣=⑤+=⑥+=
下面各题怎样算简便就怎样算． 6﹣﹣．
直接写得数．﹣=﹣=+=+=+=﹣=﹣= 0.3+=
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=
﹣
= 1﹣
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﹣
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=
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= 2+
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=
﹣
=
﹣
+
+
﹣
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﹣
．
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=③
﹣
=
=⑤
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=⑥
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=
﹣
．
﹣
=
﹣
=
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=
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=
+
=
﹣
=
﹣
= 0.3+
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