-(y的平方 5 2y) (3y-2 4y的平方),其中y=-2-搜答案-灵鹊做题网

因为y本身是函数（y是x的函数）,对y的平方求导属于复合函数求导,明白了吗?

(x+y)的平方-2x-2y-3=(x+y)的平方-2(x+y)-3=(x+y-3)(x+y+1)

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)(

Y^2(2X+1)(X-3)

（x+y）(x+2y)=x²+xy+2xy+2y²=x²+3xy+2y²

=x²+2xy+3x+y²+3y+2=（x+y）²+3（x+y）+2=（x+y+1）(x+y+2)

y的三次方-3y平方+y-2=y（y的平方-y-1）-2（y的平方-y-1）-4=-4

3a(x-y)-2(y-x)^2=3a(x-y)-2(x-y)^2=(x-y)[3a-2(x-y)]=(x-y)(3a-2x+2y)

3(x-y)²*(y-x)²*2(x-y)=6(x-y)^(2+2+1)=6(x-y)^5再问：需要再详细一点的过程再答：3(x-y)²*(y-x)²*2(x-

(3x-4y)(4x+3y)-2(2x-y)^2=12x^2-7xy-12y^2-2(4x^2-4xy+y^2)=4x^2+xy-14y^2(4x-7y)(x+2y)

(x-y)平方+2y(x-y)=(x-y)(x-y+2y)=(x-y)(x+y)

(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)/(2y)=X^2-y^2-y^2+X^2+y^2-2xy-3x^2+xy=-x^2-y^2-xy=-(x^2+y^2+xy-3

楼主你说“求6x的平方-4x=5的值”,有问题,我推测是6x的平方-4x+5的值由14x+5-21x²==-2得14x-21x²=-7所以21x²-14x=7化简后3x&

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)

[1]y+2分之y的平方-6y+9除以[3-y]=（3-y)²/(y+2)×/(3-y)=(3-y)/(y+2)[2]x的立方分之x的平方y乘以[-y分之1]=x²y/x³

原式=X²-9Y²-(X²-2XY-4Y²)-(4X²-4XY+Y²)=X²-9Y²-X²+2XY+4Y&su

先由两已知方程解得x=27/8,y=9/8,然后接下来的自己算啦...两方程的话,先将第二个两边都乘三,再于第一个相减得出y,再将y带进方程得x

(x+2)^2-(y-3)^2=(x+y)*(x-y)x^2+4x+4-y^2+6y-9=x^2-y^24x+6y-5=0即为所求的方程

【(x-y)的3次方-8(x-y)的2次方(x+y)+6y(x-y)的平方】/2(x-y)的平方=(x-y)²[x-y-8(x+y)+6y]/2(x-y)²=1/2（x-y-8x-

(3x-y)的平方-(2x+y)的平方-5(x-y)=(3x-y+2x+y)(3x-y-2x-y)-5(x-y)=5x(x-2y)-5(x-y)=5x^2-10xy-5x+5y