一只长方体的玻璃缸长8dm，宽6dm，高4dm，水深2.8dm，投入一个铁块后，铁块全部淹没，水深现在为3.4dm，这块铁块的体积为多少？
直接写得数= = = = == = = = =
直接写得数= = = 3÷8= = == = = = = =
直接写出得数．93= 8.7﹣7= ÷1= 21÷7=7×÷7×= 44÷= 75÷10%= 0.9+99×0.9=
直接写出得数 ．
直接写出得数．÷= += ÷= ×=1÷0.25= ÷1= ÷3= ﹣=
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= 75÷10%= 0.9+99×0.9=
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