小明做了一个实验：在一个长18厘米，宽15厘米，高20厘米的鱼缸里倒入一些水，再放进一块铁块，使之全部没入水中．这时测得水深是18厘米，取出铁块后，测得水深是14厘米．这块铁块的体积是多少？
直接写得数．×0=×=×12=×= 45×=÷=×=÷= 18×=×= 1÷=÷=
直接写出得数．×12=÷=（ ）2= 4﹣4×= 1×= 43÷=÷=×8+×8= 0.9×= 12×﹣=×7÷×7==
直接写出得数．÷= 0×=÷=÷1=÷= 1+=×=×=
直接写出得数． 12×=+=÷8=﹣=
直接等结果×1=﹣= 0.25×0.4=÷= 5+5= 16×（﹣）= 4×25%=÷4=
×0=
×
=
×12=
×
=
=
÷
=
×
=
÷
=
=
×
= 1÷
=
÷
=
×12=
÷
=（ 
）2= 4﹣4×
= 1
×
= 43÷
=
÷
=
×8+
×8= 0.9×
= 12×
﹣
×7÷
=
÷
=
÷
=
÷1=
÷
= 1+
=
×
=
×
=
=
+
÷8=
﹣
=
×1
=
﹣
= 0.25×0.4=
÷
=
= 16×（
﹣
）= 4×25%=
÷4=
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