已知：x=，y=，求代数式的值。-九年级数学

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• 若，则的值为（）。-九年级数学
• 计算的结果是[]A.B.C.1D.-1-九年级数学
• 下列计算正确的是[]A．B．C．D．-九年级数学
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• 已知，则的值等于[]A.6B.-3C.D.-八年级数学
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• 化简：x-+2=（）。-八年级数学
• 化简：-九年级数学
• 计算：=（）。-九年级数学
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• 计算：=（）。-九年级数学
• 已知，则（）。-八年级数学
• 化简的结果是[]A.B.C.D.-八年级数学
• 化简的结果是[]A.B.C.1D.-1-八年级数学
• 计算：。-八年级数学