正数都比0大，负数都比0小． ．
直接写出得数．========
5个与8个合并起来，结果是多少？
直接写出得数．==÷== 3÷=×99+= 1.9÷1%= 0.25×0.24=20×（1+50%）=
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与8个
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×99+
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