分解因式:(1)5(x-y)³+10(y-x)² (2)mn(m-n)-m(n-m)
分解因式:5(x-y)³+10(y-x)²(2)mn(m-n)-m(n-m)拜托啦我很急的帮帮忙啊...
分解因式:5(x-y)³+10(y-x)² (2)mn(m-n)-m(n-m) 拜托啦我很急的帮帮忙啊
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解:5﹙x-y﹚³+10﹙y-x﹚²
=5﹙x-y﹚³+10﹙x-y﹚²
=5﹙x-y﹚²﹙x-y+2﹚
mn﹙m-n﹚-m﹙n-m﹚
=mn﹙m-n﹚+m﹙m-n﹚
=m﹙m-n﹚﹙n+1﹚
=5﹙x-y﹚³+10﹙x-y﹚²
=5﹙x-y﹚²﹙x-y+2﹚
mn﹙m-n﹚-m﹙n-m﹚
=mn﹙m-n﹚+m﹙m-n﹚
=m﹙m-n﹚﹙n+1﹚
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(1)
5(x-y)³+10(y-x)²
=5(x-y)²(x-y)+10(x-y)²
=(x-y)²(5x-5y+10)
=5(x-y)²(x-y+2)
(2)
mn(m-n)-m(n-m)
=mn(m-n)+m(m-n)
=(m-n)(mn+m)
=m(m-n)(n+1)
5(x-y)³+10(y-x)²
=5(x-y)²(x-y)+10(x-y)²
=(x-y)²(5x-5y+10)
=5(x-y)²(x-y+2)
(2)
mn(m-n)-m(n-m)
=mn(m-n)+m(m-n)
=(m-n)(mn+m)
=m(m-n)(n+1)
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你好,很高兴回答你的问题
①5(x-y)³+10(y-x)²
=(x-y)² [5(x-y) -10]
=(x-y)² (5x-5y-10)
=5(x-y)²(x-y-2)
②mn(m-n)-m(n-m)
=(m-n)(mn+n)
=n(m-n)(m+1)
①5(x-y)³+10(y-x)²
=(x-y)² [5(x-y) -10]
=(x-y)² (5x-5y-10)
=5(x-y)²(x-y-2)
②mn(m-n)-m(n-m)
=(m-n)(mn+n)
=n(m-n)(m+1)
追问
第二问的答案不是mn﹙m-n﹚-m﹙n-m﹚
=mn﹙m-n﹚+m﹙m-n﹚
=m﹙m-n﹚﹙n+1﹚ 吗?
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