用分式表示下列各式的商,并约分.(1)12a²b³÷(-8a³b) (2)(m²-2m+1)÷(m²-1) 计算:(1)(a²-2a)÷(ab-2b) (2)(x²-9)÷(x²-6x+9) (3)(m的4次方-18m²+81
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![用分式表示下列各式的商,并约分.(1)12a²b³÷(-8a³b) (2)(m²-2m+1)÷(m²-1) 计算:(1)(a²-2a)÷(ab-2b) (2)(x²-9)÷(x²-6x+9) (3)(m的4次方-18m²+81](/uploads/image/z/11947020-60-0.jpg?t=%E7%94%A8%E5%88%86%E5%BC%8F%E8%A1%A8%E7%A4%BA%E4%B8%8B%E5%88%97%E5%90%84%E5%BC%8F%E7%9A%84%E5%95%86%2C%E5%B9%B6%E7%BA%A6%E5%88%86.%EF%BC%881%EF%BC%8912a%26%23178%3Bb%26%23179%3B%C3%B7%28-8a%26%23179%3Bb%29+%EF%BC%882%EF%BC%89%EF%BC%88m%26%23178%3B-2m%2B1%EF%BC%89%C3%B7%EF%BC%88m%26%23178%3B-1%EF%BC%89+%E8%AE%A1%E7%AE%97%EF%BC%9A%EF%BC%881%EF%BC%89%EF%BC%88a%26%23178%3B-2a%EF%BC%89%C3%B7%EF%BC%88ab-2b%EF%BC%89+%EF%BC%882%EF%BC%89%EF%BC%88x%26%23178%3B-9%EF%BC%89%C3%B7%EF%BC%88x%26%23178%3B-6x%2B9%EF%BC%89+%EF%BC%883%EF%BC%89%EF%BC%88m%E7%9A%844%E6%AC%A1%E6%96%B9-18m%26%23178%3B%2B81)
用分式表示下列各式的商,并约分.(1)12a²b³÷(-8a³b) (2)(m²-2m+1)÷(m²-1) 计算:(1)(a²-2a)÷(ab-2b) (2)(x²-9)÷(x²-6x+9) (3)(m的4次方-18m²+81
用分式表示下列各式的商,并约分.
(1)12a²b³÷(-8a³b) (2)(m²-2m+1)÷(m²-1) 计算:(1)(a²-2a)÷(ab-2b) (2)(x²-9)÷(x²-6x+9) (3)(m的4次方-18m²+81)÷(m²-6m+9)
用分式表示下列各式的商,并约分.(1)12a²b³÷(-8a³b) (2)(m²-2m+1)÷(m²-1) 计算:(1)(a²-2a)÷(ab-2b) (2)(x²-9)÷(x²-6x+9) (3)(m的4次方-18m²+81
(1)12a²b³÷(-8a³b)
=12a²b³/(-8a³b)
=-3b²/2a
(2)(m²-2m+1)÷(m²-1)
=(m-1)²/(m+1)(m-1)
=(m-1)/(m+1)
计算:
(1)(a²-2a)÷(ab-2b)
=a(a-2)/b(a-2)
=a/b
(2)(x²-9)÷(x²-6x+9)
=(x+3)(x-3)/(x-3)²
=(x+3)/(x-3)
(3)(m的4次方-18m²+81)÷(m²-6m+9)
=(m²-9)²/(m-3)²
=(m+3)²(m-3)²/(m-3)²
=(m+3)²
=m²+6m+9
(1)-3b²/2a (2)m-1/m+1
(1)a/b (2)x+3/x-3(3)(m+3)(m+9)²/(m-3)
1)12a²b³÷(-8a³b) =-3b^2/2a^2
(2)(m²-2m+1)÷(m²-1)=(m-1)^2/(m-1)(m+1)=(m-1)/(m+1)
计算:(1)(a²-2a)÷(ab-2b) =a(a-2)/b(a-2)=a/b
(2)(x²-9)÷(x²-6x+9)=(x+3)(...
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1)12a²b³÷(-8a³b) =-3b^2/2a^2
(2)(m²-2m+1)÷(m²-1)=(m-1)^2/(m-1)(m+1)=(m-1)/(m+1)
计算:(1)(a²-2a)÷(ab-2b) =a(a-2)/b(a-2)=a/b
(2)(x²-9)÷(x²-6x+9)=(x+3)(x-3)/(x-3)^2=(x=3)/(x-3)
(3)(m的4次方-18m²+81)÷(m²-6m+9)=(m^2-9)^2/(m-3)^2=(m+3)^2(m-3)^2/(m-3)^2=(m+3)^2
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