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3x+5y-2x-7y= x-2y ¬Û¦PÅܶq¤~¥i¥[´î 3x©M-2x p, +5y©M-7yp |
3x+5x2-2x-7x2= x-2x2 ¬Û¦PÅܶq¤Î«ü¼Æ¤~¥i¥[´î 3x©M-2x p, +5x2©M-7x2p |
(3x+5y)-(2x-7y)+(6y-4x) = 3x+5y -2x+7y +6y-4x = -3x+18y ²¾°£¬A¸¹®É,Y«e±¬°´î,¤ºùØnÅܲŸ¹ |
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