12+9.9=1÷0.25=數(shù)學(xué)公式÷數(shù)學(xué)公式=
數(shù)學(xué)公式×50%=數(shù)學(xué)公式-數(shù)學(xué)公式=(0.75-數(shù)學(xué)公式)×96=

解:12+9.9=21.9,1÷0.25=4,÷=,
×50%=,-=,(0.75-)×96=0.

分析:本題根據(jù)小數(shù)、分?jǐn)?shù)的加法、減法、乘法與除法的運算法則及四則混合運算的運算順序計算即可.
點評:完成本題要細(xì)心,注意通分約分,同時要注意分?jǐn)?shù)與小數(shù)之間的互化.
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科目:小學(xué)數(shù)學(xué) 來源: 題型:

直接寫出得數(shù).
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科目:小學(xué)數(shù)學(xué) 來源: 題型:閱讀理解

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直接寫出下列各題的得數(shù),你是最快的!
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4
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科目:小學(xué)數(shù)學(xué) 來源: 題型:

12+9.9= 1÷0.25=
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