Seen from space, the earth looks like a blue ball, with ______ 75% of its surface covered with water

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• 计算：2﹣3=（）-七年级数学
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• （﹣2）0=（），=（），（﹣3）﹣1=（）．-七年级数学
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• 计算：4﹣2=（）-七年级数学
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