有一种矿石的几种元素含量所占的百分比如图．（1）从图中你能得到哪些信息？（2）如果采集到这种矿石2000吨，那么能够提炼出铁、锌、锰等金属各多少吨？
口算 56×= 2﹣=+= 6×= 0.25×4= 57×=÷= 1÷= 21÷=÷= 1÷= 0÷=
计算下面各题．×21×÷5×÷÷÷÷24×÷8．
计算．×9=×0= 0÷=÷= 12×=×=÷=÷=
直接写得数×=÷5=×12=×=÷=÷=×= 1÷== 45×=÷2=÷=×=÷=×0=×= 1﹣=÷=×= 15÷=
口算×6=+=×=×6=÷=÷= 1﹣=﹣=×4=÷=
= 2﹣
=
+
= 6×
= 0.25×4= 57×
=
÷
= 1÷
= 21÷
=
÷
= 1÷
= 0÷
=
×21×
÷5×
÷
÷
÷
÷24
×
÷8．
×9=
×0= 0÷
=
÷
=
×
=
÷
=
÷
=
×
=
÷5=
×12=
×
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÷
÷
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×
= 1÷
=
= 45×
=
÷2=
÷
=
×
=
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×0=
×
= 1﹣
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÷
=
×
= 15÷
=
×6=
+
=
×
=
×6=
÷
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= 1﹣
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﹣
=
×4=
÷
=
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