12x^2 xy-6y^2的分解因式
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(x-y)(x-y-2)-3
答:-x³y+2x²y-xy=-xy(x²-2x+1)=-xy(x-1)²
3x^2+5xy-2y^2+x+9y-4=(3x-y)(x+2y)+4x+8y-3x+y-4={(3x-y)+4}(x+2y)-3x+y-4=(3x-y+4)(x+2y-1)
2.6x²-13xy+6y²+22x-23y+20=(2x-3y)(3x-2y)+22x-23y+4×5=(2x-3y+4)(3x-2y+5)3.(x²+4x+8)
x³-36x+12x²=x﹙x²+12x-36﹚2x²-4xy+2y²=2﹙x-y﹚².
双十字相乘.
解2x²y-x³-xy²=x(2xy-x²-y²)=-x(x²-2xy+y²)=-x(x-y)²
原式=(xy)2+2xy+3-2(x+y)-1-(x+y)2+2(x+y)-1,=(xy)2+2xy+1-(x+y)2,=(xy+1)2-(x+y)2,=(xy+1+x+y)(xy+1-x-y),=(
4x^2-12xy+9y^2-2x+3y-6=(4x^2-12xy+9y^2)-(2x-3y)-6=(2x-3y)^2-(2x-3y)-6=(2x-3y+2)(2x-3y-3)
12x^2+xy-6y^2=(4x+3y)(3x-2y)
3x²+5xy-2y²+x+9y-4=(3x-y)(x+2y)+x+9y-4=(3x-y+4)(x+2y-1)用二次十字相乘法:(1)3x²+5xy-2y²=(
xy^3-2x^2y^2+x^3y=xy(y^2-2xy+x^2)=xy(y-x)^2选我啊
3x-2y4x3y再问:什么意思??能详细一点吗??再答:3×4=12x^2前的系数-2×3=6y^2前的系数交叉相乘,得到的系数相加就是xy前的系数
原式=(x+y)(x+2y)+2(x+2y)=(x+2y)(x+y+2)希望我的回答能帮助到您,
你的式子是无法分解的,已经是最简代数式了x^2-xy+y^2=(x-y/2)^2+3y^2/4恒大于0,无法分解
2x的平方-xy-6y的平方=(2x-3y)(x+2y)
授人以鱼不如教人以渔,解这样的题关键还是要有思路,不能向上面的人只给答案,将来你还是会遇到问题.思路如下:-2x²y-12xy²+8xy³=xy(8y^2-2x-12y)
2x^2+3xy-2y^2-x+8y-6=(x+2y)(2x-y)-x+8y-6=(x+2y-2)(2x-y+3)
原式=(x+y)(x+y)+2(x+y)xy+(xy)^2-1^2=(x+y)^2+2(x+y)xy+(xy)^2-1=(x+y+xy)^2-1=(x+y+xy-1)(x+y+xy+1)=(x+y+x
(xy-1)^2+(x+y-2xy)(x+y-2)=(xy-1)^2+4xy+(x+y)^2-2(xy+1)(x+y)=(xy+1)^2+(x+y)^2-2(xy+1)(x+y)=(x+1)^2(y+