5x²y+(m-5)x³y²-(n-3/2)x²y³+5xy五次方则m=n=减了后不含五次项!

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5x²y+(m-5)x³y²-(n-3/2)x²y³+5xy五次方则m=n=减了后不含五次项!
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5x²y+(m-5)x³y²-(n-3/2)x²y³+5xy五次方则m=n=减了后不含五次项!
5x²y+(m-5)x³y²-(n-3/2)x²y³+5xy五次方
则m=
n=
减了后不含五次项!

5x²y+(m-5)x³y²-(n-3/2)x²y³+5xy五次方则m=n=减了后不含五次项!
五次方指的是哪个的五次方啊?