已知(3x²y+Axy²-1)-(4x²y-3xy²)=Bx²y-5xy²-1则(A-B)负一次幂=
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![已知(3x²y+Axy²-1)-(4x²y-3xy²)=Bx²y-5xy²-1则(A-B)负一次幂=](/uploads/image/z/3738669-69-9.jpg?t=%E5%B7%B2%E7%9F%A5%EF%BC%883x%26%23178%3By%2BAxy%26%23178%3B-1%EF%BC%89-%EF%BC%884x%26%23178%3By-3xy%26%23178%3B%EF%BC%89%3DBx%26%23178%3By-5xy%26%23178%3B-1%E5%88%99%EF%BC%88A-B%29%E8%B4%9F%E4%B8%80%E6%AC%A1%E5%B9%82%3D)
已知(3x²y+Axy²-1)-(4x²y-3xy²)=Bx²y-5xy²-1则(A-B)负一次幂=
已知(3x²y+Axy²-1)-(4x²y-3xy²)=Bx²y-5xy²-1则(A-B)负一次幂=
已知(3x²y+Axy²-1)-(4x²y-3xy²)=Bx²y-5xy²-1则(A-B)负一次幂=
(3x²y+Axy²-1)-(4x²y-3xy²)=Bx²y-5xy²-1
3x²y+Axy²-1-4x²y+3xy²=Bx²y-5xy²-1
-x²y+8xy²=Bx²y-Axy²
A=-1 B=-8
(A-B)负一次幂=1/[-1-(-8)]
=1/7