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相关试题
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=我能很快写出得数．
50×5= 49+35= 21×4= 900×9= 700+600= 8000﹣2000=
45÷6= 71×2≈ 102×6≈ 198×5≈ 
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我能很快写出得数．
50×5= 49+35= 21×4= 900×9= 700+600= 8000﹣2000=
45÷6= 71×2≈ 102×6≈ 198×5≈ ﹣= +=
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= 10﹣3.7﹣2.3= 
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