0.5×0.9=0.8+0.6×2=2.3×2+3=
100×0.053+0.47=4.5×2+1.5=3.6×3×0.2=
0.8-0.8×1=2.8×4-2.2=

解:0.5×0.9=0.450.8+0.6×2=22.3×2+3=7.6
100×0.053+0.47=5.774.5×2+1.5=10.53.6×3×0.2=2.16
0.8-0.8×1=02.8×4-2.2=9

分析:①先算5×9,然后在結(jié)果中從后向前數(shù)出兩位,點上小數(shù)點;②③④⑤先算乘法,再算加法;⑥從左往右依次運算;⑦⑧先算乘法,再算減法.
點評:此題考查了小數(shù)的四則運算,注意運算順序和運算法則.
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