求八年级下数学化简求值习题集 附答案 谢谢!
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求八年级下数学化简求值习题集 附答案 谢谢!
![求八年级下数学化简求值习题集 附答案 谢谢!](/uploads/image/z/5306245-61-5.jpg?t=%E6%B1%82%E5%85%AB%E5%B9%B4%E7%BA%A7%E4%B8%8B%E6%95%B0%E5%AD%A6%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC%E4%B9%A0%E9%A2%98%E9%9B%86+%E9%99%84%E7%AD%94%E6%A1%88+%E8%B0%A2%E8%B0%A2%21)
A2 + 2A-1 = 0
A2 + 2A = 1
原来的公式= [(A-2)/ A(A + 2) - (A-1)/(A?+ 2)2]×(A + 2)/(A-4)
= {[(A-2)(A + 2)-a(A-1)] / A(A + 2) 2}×(A +2)/(A-4)
=(A2-4-A2 + A)(A +2)/ [A(A-4)(A + 2)2] =(A-24)(A +2)/ [A(A-4)(A + 2)2]
= 1 /(A2 + 2A)
= 1 = 1
再问: 还要更多
A2 + 2A = 1
原来的公式= [(A-2)/ A(A + 2) - (A-1)/(A?+ 2)2]×(A + 2)/(A-4)
= {[(A-2)(A + 2)-a(A-1)] / A(A + 2) 2}×(A +2)/(A-4)
=(A2-4-A2 + A)(A +2)/ [A(A-4)(A + 2)2] =(A-24)(A +2)/ [A(A-4)(A + 2)2]
= 1 /(A2 + 2A)
= 1 = 1
再问: 还要更多