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        1. 2.5÷11=
          0.2
          ?
          2
          ?
          7
          0.2
          ?
          2
          ?
          7
          ,保留兩位小數(shù)是
          0.23
          0.23
          分析:根據(jù)小數(shù)除法的計(jì)算方法,求出2.5÷11的商,然后再根據(jù)四舍五入法保留兩位小數(shù).
          解答:解:
          2.5÷11=0.2
          ?
          2
          ?
          7
          ;
          0.2
          ?
          2
          ?
          7
          ≈0.23.
          答:2.5÷11=0.2
          ?
          2
          ?
          7
          ,保留兩位小數(shù)是0.23.
          故答案為:0.2
          ?
          2
          ?
          7
          ,0.23.
          點(diǎn)評(píng):關(guān)鍵是求出商,用循環(huán)小數(shù)表示出來(lái),然后再根據(jù)四舍五入法保留兩位小數(shù).
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          1
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          科目:小學(xué)數(shù)學(xué) 來(lái)源: 題型:解答題

          3×1.5=2.5×4=0÷0.9=4÷0.2=
          0.56÷0.7=0.24×5=0.2×5=2.1-0.87=
          3.54-3.5=3.4-1.5=12÷0.6=8×0.125=
          0.7×11=0.13+1.7=3.15÷0.5=0.9÷4.5=
          0.2×0.3=1.2+0.56=3-1.7=1÷0.25=
          78÷1.3=15÷0.3=2.1+1.49=6.24-1.5=
          1.2×0.3=6.3÷6.3=1.6×0.2=3.7-1.2=
          4.58-3.5=72.8÷8=3.5×0.3=0.25×100=
          3.2-2=0.51÷17=5.3÷0.01=1.03×3=
          2.8+12=3.5×2=2.2×0.1=1-0.25=
          0.62-0.32=6.3÷0.21=1.7×10=0.12×3=
          0.45×2=1.2÷0.3=1÷2=4.8×100=
          0.25×8=0.89÷8.9=17.8+2.2=0.8÷0.2=
          5.79÷0.1=0.35+0.65=8.9-0.9=9.2-9.2=
          3.6÷0.4=15.15÷15=0.2×0.3×0.1=1.34×4×2.5=

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