4) =8x³y-4xy-x³y=7x³y-4xy.---- степень 4
5)=4x³y-3xy-4x³y+6= -3xy+6--- степень 2
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4) =8x³y-4xy-x³y=7x³y-4xy.---- степень 4
5)=4x³y-3xy-4x³y+6= -3xy+6--- степень 2