x+y的平方-14x+y+49因式分解
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x^2=x的平方‘/’为除以[(x+2y)^2-(x+y)(x-y)-5y^2]/(2x)=[(x^2+4xy+4y^2)-(x^2-y^2)-5y^2]/(2x)=[4xy]/(2x)=2y[(3x
2(y-x)²-7(x-y)+6(x-y)-3(y-x)²=-(y-x)²-(x-y)=-(x-y)²-(x-y)=-(x-y)[(x-y)+1]=(y-x)(
25(x+y)的平方-9(x-y)的平方=[5(x+y)+3(x-y)][5(x+y)-3(x-y)]=(8x+2y)(2x+8y)=4(4x+y)(x+4y)
(x平方+y平方)平方-y平方=x平方+6所以(x²+y²)²-(x²+y²)-6=0(x²+y²+2)(x²+y
两式子相加相减得(X+Y)的平方=16X方-Y方=12题一解为4题二解为4
结果是(x+y-7)的平方
(x-y)平方+2y(x-y)=(x-y)(x-y+2y)=(x-y)(x+y)
(x+y)(x-y)+(x-y)的平方-(6X的平方Y-2XY的平方)/2Y=x²-y²+x²-2xy+y²-3x²+xy=-x²-xy
分解因式(x+y)的平方-14(x+y)+49(x+y)²-14(x+y)+49=(x+y)²-2*7*(x+y)+7²=[(x+y)-7]²=(x+y-7)&
把x+y当做一个因子,7当做一个因子(x+y)^2-14(x+y)+49=(x+y)^2-2*7*(x+y)+7^2=(x+y-7)^2
x/(x+y)(x--)^3=x/(x+y)(x--y)^3y/(y+x)(y--x)^2=y(x--y)/(x+y)(x--y)^3.
x8+256y8-32x4y4(用手机打的不要介意,给个最佳答案吧)
x(x-y)²-(y-x)³=x(x-y)²+(x-y)³=(x-y)²[x+(x-y)]=(x-y)²(2x-y)
∵4x²-y²+2x-y=(2x-y)(2x+y)+(2x-y)=(2x-y)(2x+y+1)∴4x²-y²+2x-y=(2x-y)(2x+y+1)不懂得欢迎追
36(x+y)²-49(x-y)²=[6(x+y)+7(x-y)][6(x+y)-7(x-y)]=(6x+6y+7x-7y)(6x+6y-7x+7y)=(13x-y)(-x+13y
x的平方-x-4y的平方+2y=(x-2y)(x+2y)-(x-2y)=(x-2y)(x+2y-1)
x+y=7x-y=4解得,x=11/2,y=3/2或x+y=-7x-y=4解得,x=-3/2,y=11/2所以x²+y²=65/2再问:x+y=7怎么来的?请教一下谢谢再答:(x+
(x平方+2xy+y的平方)/(x+y)=(x+y)²/(x+y)=x+y