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    数学公式+数学公式=0.2-数学公式=0.5×数学公式=0.9÷0.01=
    2-2÷3=3÷数学公式×3=（数学公式+数学公式）×20=18数学公式÷9=
    100×数学公式÷0.1=9数学公式×3÷9数学公式×3=

    解：+=               0.2-=0                0.5×=0.1            0.9÷0.01=90
    2-2÷3=1                 3÷×3=27             （+）×20=9         18÷9=2
    100×÷0.1=100        9×3÷9×3=9
    分析：根据分数、小数的四则混合运算进行计算即可得到答案．
    点评：此题主要考查的是分数和小数的四则混合运算．
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