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4x^2-3xy=2y^2-2(2x^2-5xy+y^2) 4x^2-3xy=2y^2-4x^2+10xy-2y^2 8x^2-13xy=0 當x=2.y=3時 原式=32-13*2*3=-46 注:4x^2就是4x的平方.不念4x的2平方哦. 希望我的答案對你有用.祝愉快
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