xy-2/3y-2/3)-(1/2x-1/2xy+1)其中x=2/3,y=3/4求化简后的值

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xy-2/3y-2/3)-(1/2x-1/2xy+1)其中x=2/3,y=3/4求化简后的值xy-2/3y-2/3)-(1/2x-1/2xy+1)其中x=2/3,y=3/4求化简后的值xy-2/3y-

xy-2/3y-2/3)-(1/2x-1/2xy+1)其中x=2/3,y=3/4求化简后的值
xy-2/3y-2/3)-(1/2x-1/2xy+1)其中x=2/3,y=3/4求化简后的值

xy-2/3y-2/3)-(1/2x-1/2xy+1)其中x=2/3,y=3/4求化简后的值
(xy-2/3y-2/3)-(1/2x-1/2xy+1)
=xy-2/3y-2/3-1/2x+1/2xy-1
=(1+1/2)xy-2/3y-1/2x-(2/3+1)
=3/2xy-2/3y-1/2x-5/3
当x=2/3,y=3/4时,原式=3/2*2/3*3/4-2/3*3/4-1/2*2/3-5/3
=3/4-1/2-1/3-5/3
=-7/4.

(1/2-1/2-2/3)-(1/3-1/4+1)
-2/3-1/12-1
-7/4

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