若(xy-2)²+|3-y|=0,求代数式(5xy-3y)-[5x-(4xy+2y-5x)]的值.

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若(xy-2)²+|3-y|=0,求代数式(5xy-3y)-[5x-(4xy+2y-5x)]的值.若(xy-2)²+|3-y|=0,求代数式(5xy-3y)-[5x-(4xy+2y

若(xy-2)²+|3-y|=0,求代数式(5xy-3y)-[5x-(4xy+2y-5x)]的值.
若(xy-2)²+|3-y|=0,求代数式(5xy-3y)-[5x-(4xy+2y-5x)]的值.

若(xy-2)²+|3-y|=0,求代数式(5xy-3y)-[5x-(4xy+2y-5x)]的值.
∵(xy-2)²+|3-y|=0
∴xy-2=0 3-y=0
xy=2 y=3
∴x=2/3 y=3
(5xy-3y)-[5x-(4xy+2y-5x)]
=5xy-3y-5x+4xy+2y-5x
=9xy-y-10x
=9*2-3-10*2/3
=18-3-20/3
=15-20/3
=25/3