把一根2米的长方体木料锯成1米长的两段，表面积增加了2平方分米，求这跟木料原来的体积．
直接写得数．+= 43×200= 1﹣= 350+50= 630÷7= 15×6÷9=+= 45﹣9×5=
直接写出得数﹣=﹣=+=+= 1﹣﹣=+=﹣=+=
直接写得数．﹣=+=+= 1﹣﹣=﹣=+= 1﹣=﹣+=
直接写出计算结果．======= 1 = 1﹣=
======= 36×（﹣）=
+
= 43×200= 1﹣
= 350+50=
+
= 45﹣9×5=
﹣
=
﹣
=
+
=
+
﹣
=
=
﹣
=
+
=
﹣
=
+
=
+
= 1﹣
﹣
=
﹣
=
+
= 1﹣
=
﹣
+
=
=
=
=
=
=
=
= 1 
= 1﹣
=
=
=
=
=
=
=
= 36×（
﹣
）=
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