先化简,再求值:m²-4m+4/m²-1 ÷ m-2/m-1 +2/m-1,其中m=2
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先化简,再求值:m²-4m+4/m²-1 ÷ m-2/m-1 +2/m-1,其中m=2
先化简,再求值:m²-4m+4/m²-1 ÷ m-2/m-1 +2/m-1,其中m=2
先化简,再求值:m²-4m+4/m²-1 ÷ m-2/m-1 +2/m-1,其中m=2
题目是[﹙m²-4m+4﹚/m²-1] ÷ ﹙m-2/m-1 +2/m-1﹚?
还是m²-4m+﹙4/m²-1 ÷ m﹚-2/m-1 +2/m-1?
或者是[m²-4m+﹙4/m²-1﹚] ÷ ﹙m-2/m-1 +2/m-1﹚?
原式=(m+2)/m(m-2)-(m-1)/(m-2)²×m/(m-1)
=(m+2)/m(m-2)-m/(m-2)²
=[(m+2)(m-2)-m²]/m(m-2)²
=-4/[m(m-2)²]