=(x+y)(x-y)-(x+y)
=(x+y)(x-y-1)追问
已知a+2b=3求1/16a^2+1/4b^2+1/4ab
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本回答被提问者采纳已知a+2b=3求1/16a^2+1/4b^2+1/4ab
=(x+y)(x-y)-(x+y)
=(x+y)(x-y-1)
(x^2-y^2)-(x+y) 因式分解
(x^2-y^2)-(x+y)=(x+y)(x-y)-(x+y)=(x+y)(x-y-1)
2(x^2-y^2)-x+y因式分解
=(x-y)[2(x+y)-1]=(x-y)(2x+2y-1)(a-b)²+2a-2b+1 =(a-b)²+2(a-b)+1 =[(a-b)+1]²=(a-b+1)²3mp²+12mpq+12mq²(如果式子是这样的话,最后一项是12mq²)=3m(p²+4pq+4q²)=3m(p+2q)²(x+y)&#...
x^2-y^2-x-y 因式分解
x^2-y^2-x-y =(x^2-y^2)-(x+y) 【分组分解】=(x+y)(x-y)-(x+y) 【平方差公式】=(x+y)(x-y-1) 【提取公因式(x+y) 】
x^2-y^2-(x+y)^2,因式分解
x^2-y^2-(x+y)^2 =(x-y)(x+y)-(x+y)^2 =(x-y-x-y)(x+y)=-2y(x+y)
因式分解:x平方-y平方-x+y
x平方-y平方-x+y =（x+y)(x-y)-(x-y)=(x+y-1)(x-y)
因式分解x^2-y^2-x-y
x^2-y^2-x-y =(x^2-x)-(y^2+y)=x(x-1)-y(y+1)
(x^2-y^2)(x+y)=(x-y)( )
左边=(x+y)(x-y)(x+y)=（x-y)(x+y)^2 所以空格里填x加y括号的平方
把x^2-y^2+(x+y)因式分解
x^2-y^2+(x+y)=(x+y)(x-y)+(x+y)=(x+y)(x-y+1)
因式分解 (x^2-y^2)(x-y)^2-(x-y)^4
(x^2-y^2)(x-y)^2-(x-y)^4 =(x-y)^2[(x^2-y^2)-(x-y)^2]=(x-y)^2(x^2-y^2-x^2+2xy-y^2)=(x-y)^2(-2y^2+2xy)=2y(x-y)^2(x-y)=2y(x-y)^3
x-y平方+2y(x-y)的因式分解
x的平方-xy-2y的平方=(x-2y((x+y) -x-y= -(x+y)
