数学:先化简,再求值m²-2m+1/m²÷(m-1-m-1/m+1),其中m=√3
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原式=[(m²-2m+1)/m²]÷[m-1-(m-1)/(m+1)]
=[(m-1)²/m²]÷[(m-1)(m+1)/(m+1)-(m-1)/(m+1)]
=[(m-1)²/m²]÷[(m²-1-m+1)/(m+1)]
=[(m-1)²/m²]÷[(m²-m)/(m+1)]
=[(m-1)²/m²]×{ (m+1)/[m(m-1)] }
=(m-1)(m+1)/m³
=(m²-1)/m³
=(√3²-1)/√3³
=2/(3√3)
=(2×√3)/(3√3×√3)
=(2√3)/9
=[(m-1)²/m²]÷[(m-1)(m+1)/(m+1)-(m-1)/(m+1)]
=[(m-1)²/m²]÷[(m²-1-m+1)/(m+1)]
=[(m-1)²/m²]÷[(m²-m)/(m+1)]
=[(m-1)²/m²]×{ (m+1)/[m(m-1)] }
=(m-1)(m+1)/m³
=(m²-1)/m³
=(√3²-1)/√3³
=2/(3√3)
=(2×√3)/(3√3×√3)
=(2√3)/9
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