0.46+0.54=0.4×50=50×0.84×0.2=3.23×98+3.23×2=
3.1-0.45-0.55=1.6÷2=3.14÷0.314=8.4÷0.21=

解：
（1）0.46+0.54=1；（2）0.4×50=20；（3）50×0.84×0.2=8.4；（4）3.23×98+3.23×2=323；
（5）3.1-0.45-0.55=2.1；（6）1.6÷2=0.8；（7）3.14÷0.314=10；（8）8.4÷0.21=40．

分析：（1）根據(jù)小數(shù)的加法法則計算即可；
（2）根據(jù)小數(shù)的乘法法則計算即可；
（3）根據(jù)乘法交換律和結(jié)合律簡便計算；
（4）根據(jù)乘法分配律簡便計算；
（5）根據(jù)連減的簡算計算即可；
（6）（7）（8）根據(jù)小數(shù)的除法法則計算即可．
點評：考查了四則運算，解題的關(guān)鍵是熟悉運算法則和靈活運用運算定律簡便計算．
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科目：小學數(shù)學 來源： 題型：

0.46+0.54= 0.4×50= 50×0.84×0.2= 3.23×98+3.23×2=
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科目：小學數(shù)學 來源： 題型：閱讀理解

4.7+2.3= 4.5×2= 6.9-2.5= 7.2×0.8=
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科目：小學數(shù)學 來源： 題型：解答題

4.7+2.3=4.5×2=6.9-2.5=7.2×0.8=
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3.6÷24=0.8×1.1=7.2+12.8=46.7-3.8=
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1÷2.5=1.25×0.8=3.2÷0.04=0÷1.7=
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10.5×0.4=7.3+0.27=8×0.125=0.54÷0.6=
0.61+0.39=0.56÷28=10÷20=4.08÷0.4=
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