把9(x-y)2+12(x2-y2)+4(x+y)2因式分解得
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把9(x-y)2+12(x2-y2)+4(x+y)2因式分解得把9(x-y)2+12(x2-y2)+4(x+y)2因式分解得把9(x-y)2+12(x2-y2)+4(x+y)2因式分解得9(x-y)&
把9(x-y)2+12(x2-y2)+4(x+y)2因式分解得
把9(x-y)2+12(x2-y2)+4(x+y)2因式分解得
把9(x-y)2+12(x2-y2)+4(x+y)2因式分解得
9(x-y)²+12(x²-y²)+4(x+y)²
=[3(x-y)]²+2×3(x-y)×2(x+y)+[2(x+y)]²
=[3(x-y)+2(x+y)]²
=(5x-y)²
计算(x+y/x-y + 4xy/y2-x2)(x2-9y2)/(x2+2xy-3y2)
把9(x-y)2+12(x2-y2)+4(x+y)2因式分解得
解下列方程组(1)x2/4-y2=1,x-y-2=0:(2)(x-3)2+y2=9,x+2y=0 (3)x2+y2=4,x2-y2=2
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已知x,y满足(x2+y2)(x2+y2-1)=2,则x2+y2的值为多少?x2,y2表示x和y的平方
解方程组 {3x2-y2=8 {4x2+12xy+9y2=1 {x2+2xy+y2-4=0 x2+xy+y2=4 4x2-9y2=0 x2-2xy+y2-1=0还有{x2+y2=4xy-y2+4=0x2-----x的平方 y2------y的平方 还有{2x-3y=12x2-3xy+y2-4x+3y-3=0
计算(2x+3y)(2x-3y)(9y2+4x2)-(4x2-9y2)2
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已知实数x,y满足关系:x2+y2-2x+4y-20=0(1)求x2+y2的范围(2)x/y的范围
解下列方程组(1)x2/4-y2=1,x-y-2=0:(2)(x-3)2+y2=9,x+2y=0
9(x-y)2-12(y2-x2)+4(x+y)2 因式分解
已知x/y=2,求(x+y)2-4xy/x2+y2
x,y满足线性约束条件x-2y+7≥0,4x-3y-12≤0,x+2y-3≥0,求函数z=x2+y2的最大值和最小值.(x2、y2表示平方)
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已知:x/2=y/3=z/4,求(x2+y2-z2-2xy)/(x2-y2+z2-2xz)除以(x2-y2-z2+2yz)/(x2+y2-z2+2xy)
已知:x/2=y/3=z/4,求(x2+y2-z2-2xy)/(x2-y2+z2-2xz)除以(x2-y2-z2+2yz)/(x2+y2-z2+2xy)