4) Add : 1) 3x²y , - 5x2y , - xạy
2) 2x2 + 3xy – 5 , 3xy + x2 - 2
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( 2x२+ 3xy -5 )+( 7 + 2xy-x)-(3xy+x२-2)
( 2x२+ 3xy-5+7+2xy-x)-3xy-x2
2x२+5xy-x+2-3xy-x२-2
2x२-x२+5xy-3xy-x+2+2
=x२+2xy-x+y
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