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=
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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