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3. (-x²y + 5xy + 7x)-(3xy + x²y-3x - 2z) = = -x²y + 5xy + 7x -3xy-x²y + 3x + 2z = = (-1-1) x²y + (5-3) xy + (7 + 3) x + 2z = = -2x²y + 2xy + 10x + 2z​

3 Xy 5xy 7x3xy Xy3x 2z Xy 5xy 7x 3xyxy 3x 2z 11 Xy 53 Xy 7 3 X 2z 2xy 2xy 10x 2z class=