已知-3x^m-2ny^-n+2与1/5x³y^-4+m是同类项,求(m-2n)²-5(m+n)-2
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已知-3x^m-2ny^-n+2与1/5x³y^-4+m是同类项,求(m-2n)²-5(m+n)-2
已知-3x^m-2ny^-n+2与1/5x³y^-4+m是同类项,求(m-2n)²-5(m+n)-2(m-2n)²+m+n的值.
十万火急!
已知-3x^m-2ny^-n+2与1/5x³y^-4+m是同类项,求(m-2n)²-5(m+n)-2(m-2n)²+m+n的值.
十万火急!
![已知-3x^m-2ny^-n+2与1/5x³y^-4+m是同类项,求(m-2n)²-5(m+n)-2](/uploads/image/z/2006470-46-0.jpg?t=%E5%B7%B2%E7%9F%A5-3x%5Em-2ny%5E-n%2B2%E4%B8%8E1%2F5x%26%23179%3By%5E-4%2Bm%E6%98%AF%E5%90%8C%E7%B1%BB%E9%A1%B9%2C%E6%B1%82%EF%BC%88m-2n%EF%BC%89%26%23178%3B-5%EF%BC%88m%2Bn%EF%BC%89-2)
由条件:
m-2n=3(1)
-n+2=-4+m(2)
m=2n+3
m=-n+6
∴2n+3=-n+6
n=1,m=5.
(m-2n)²-5(m+n)-2(m-2n)²+m+n
=(5-2)²-5(5+1)-2(5-2)²+5-1
=9-30-18+5-1
=-35.
m-2n=3(1)
-n+2=-4+m(2)
m=2n+3
m=-n+6
∴2n+3=-n+6
n=1,m=5.
(m-2n)²-5(m+n)-2(m-2n)²+m+n
=(5-2)²-5(5+1)-2(5-2)²+5-1
=9-30-18+5-1
=-35.
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