已知:(x+2)²+丨y-6丨=0,求2(xy²+x²y)-[2xy²-3(1-
已知(x+1)²+|y-1|=0,求2(xy-5xy²)-(3xy²-xy)得值
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已知实数xy满足x²﹢y²-xy+2x-y+1=0求xy
已知(x+3)+丨X-y+10丨=0 ,求5x²y-[2x²y-(3xy-xy²)-3x&
已知实数xy,满足10x²-2xy+y²+6x+1=0,求x+y
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已知x/2=y/3(xy≠0),求x²-2xy-3y²/x²-6xy-7y²的值
已知x/y=3,求(x²+2xy-3xy²)/(x²-xy+y²)
已知x+y=3 xy=-5 求x设abc=1 求x²+3xy+2y²/x²y+2xy
已知:(x+2)²+丨y-6丨=0,求2(xy²+x²y)-[2xy²-3(1-