分解因式x三次方 8y三次方
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8a^3-b^3=(2a)^3-b^3=(2a-b)(4a^2+2ab+b^2)
x³y³—2x²y²+xy=xy(x²y²-2xy+1)=xy[(xy)²-2xy+1]=xy(xy-1)²
能分解,立方差公式x³-y³=(x-y)(x²+xy+y²)
x的三次方y+2x的平方y的平方+xy的三次方=xy(x^2+2xy+y^2)=xy(x+y)^2
=-xy/2*(4x²-4xy+y²)=-xy/2*(2x-y)²
9(x-2y)的三次方-x的平方(x-2y)=(x-2y)[9(x-2y)²-x²]=(x-2y)[3(x-2y)+x][3(x-2y)-x]=(x-2y)(4x-6y)(2x-4
1.x³-2x²y+xy²=x(x²-2xy+y²)=x(x-y)²2.8a²b-2b=2b(4a²-1)=2b(2a-
a³-8a=a(a²-8)=a(a-2√2)(a+2√2)
x4+2x3-9x2-2x+8=0,发现x=1是方程的根,(x4+2x3-9x2-2x+8)/(x-1)=x3+3x2-6x-8x3+3x2-6x-8=0,发现x=2是方程的根,(x3+3x2-6x-
/>x^3+y^3+z^3-3xyz=x^3+x^2y+x^2z+y^2x+y^3+y^2z+z^2x+z^2y+z^3-x^2y-y^2x-xyz-xyz-y^2z-yz^2-x^2z-xyz-z^
解,设,x3=a,y3=b,z3=c.原式=(a+b)3+(c-a)3-(b+c)3令a+b=m,c-a=n原式=m3+n3-(m+n)3=-3mn(m+n)=-3(a+b)(c-a)(b+c)=-3
x³y³-2x²y²+xy=xy(x²y²-2xy+1)=xy(xy-1)²
再问:再答:等于7-x
x³y-2x²y+xy=xy(x²-2x+1)=xy(x-y)²
2x³-8x²y+8xy²=2x(x²-4xy+4y²)=2x(x-2y)²
a的三次方乘(x+y)的平方减4a的三次方c的平方=a^3[(x+y)^2-4c^2]=a^3(x+y+2c)(x+y-2c)
4(x-y)^3-8x(y-x)^2=4(y-x)^2(x-y-2x)=4(y-x)^2(-x-y)=-4(y-x)^2(x+y)秋风燕燕为您解答有什么不明白可以继续问,随时在线等.
这是两题还是一题?再问:两题再答:那就好第一题:-2x²y-x³-xy²原式=-x(2xy+x²+y²)=-x(x+y)²第二题:a
x²-2x三次方+x=-x(2x²-x-1)=-x(2x+1)(x-1)
结果是3(x-y)的2次方与(2x-5y)的积3(x-y)的2次方乘以2(x-y)-3(x-y)乘以3y,提取3(x-y)的2次方得3(x-y)的2次方乘以(2x-2y-3y),合并得:3(x-y)的