计算（1）﹣+（2）．-九年级数学

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• 若a，b为有理数，且，则ba=_________．-八年级数学
• =_________．-八年级数学
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• 填空：（1）+-=（）；（2）+-=（）；（3）3+4-=（）；（4）+-=（）。-八年级数学
• 计算：。-八年级数学
• ﹣3+=_________．-八年级数学
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• 3﹣5（精确到0.01）-八年级数学
• 。-八年级数学
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• =_________．-八年级数学
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• 计算：（1）；（2）；（3）；（4）；（5）；（6）（）。-七年级数学
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• 如图，实数a、b在数轴上的位置，化简。-八年级数学
• 计算：-八年级数学
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• 化简：（1）；（2）。-九年级数学
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• 计算的结果是（）。-八年级数学
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• 计算：（+2）﹣（﹣）-八年级数学
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• 化简：=（）。-九年级数学
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• 小马虎在下面的计算中只做对了一道题，他做对的题目是[]A．+=B．﹣=1C．3﹣=2D．3+=3-九年级数学
• 若x<0，y<0，则的值是[]A.x-yB.-x-yC.x+yD.-x+y-九年级数学
• 化简：（）。-九年级数学
• Up to now, large quantities of food ____ to Africa to save the starving people.A．is sentB．has been s