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【简答题】
预习教材P2例1,完成下列填空。 ( 1)在各城市的气温预报显示中都有( )个温度,中间用“~”隔开。左边的温度表示当地最( )气温,右边的温度表示当地最( )气温。 ( 2)比0°C( )的温度叫零下温度,通常在数字前面加 “-”。如-19°C表示( ),读作( )。 比 0°C( )的温度叫零上温度,在数字前面加“+”,这里的“+”不是加号,是正号,一般情况下可以省略不写。如+3°C表示( ),读作( ),也可以省略 “+”号写成3°C,读作( )。 ( 3)+8.7读作( ),-13读作( )。 2.预习教材P3例2 存折中的 “ 500.00 ”和“ -500.00 ”表示的意义正好相反,一个是( ) 500 元,一个是( ) 500 元。 【小结】 为了表示这两种( )意义的量,用到了两种数,一种是( ),如 500 、 3 、 4.7 等;一种是( ),如 -200 , -300 , -1.5 , 等。
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