直接写出得数．﹣+﹣+．
算一算．直接写得数．①+= ②+= ③﹣= ④﹣=
用你喜欢的方法计算．++；1﹣+；1﹣（+）；1.125+﹣；﹣+﹣．
直接写出结果、+= ﹣= ﹣=﹣= 1﹣= +=﹣= +=
直接写出得数．+= 1﹣= += ++=﹣= ﹣= ﹣= 1﹣﹣=+= 0.2+= +﹣= ﹣+﹣=
直接写得数．+= += ﹣=1﹣= ﹣= 1﹣﹣=
﹣
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﹣
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．
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= ②
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= ③
﹣
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﹣
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﹣（
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﹣
；
﹣
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﹣
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﹣
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﹣
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