问题标题:
化简求值:(x-1--x+1分之8)除以x+1分之x+3,其中X=3--根号2
问题描述:
化简求值:(x-1--x+1分之8)除以x+1分之x+3,其中X=3--根号2
靳倩回答:
(x-1-x+1分之8)除以x+1分之x+3
=(x²-1-8)/(x+1)×(x+1)/(x+3)
=(x+3)(x-3)/(x+1)×(x+1)/(x+3)
=x-3
=3-√2-3
=-√2
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