计算[(x² y²)-(x-y)² 2y(x-y)]÷4y
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1.25x²-y²2.-25x²+y²3.-(25x²+10xy+y²)4.5x²-24xy-5y²5.y^2n-x^2
等于1/X*(X-Y)
c1+c2+c32(x+y)yx+y2(x+y)x+yx2(x+y)xyr3-r2,r2-r12(x+y)yx+y0x-y0-yy-x--此时用对角线法则得=2(x+y)[x(y-x)-y^2]=-2
1/9x^2-10/9xy+y^2-(1/9x^2-y^2)=-10/9xy+2y^2=2y(y-5/9x)
(x-3y)(y+2x)-(4y-3x)(3x+4y)=2x^2-3y^2-5xy+9x^2-16y^2=11x^2-5xy-19y^2
(x+y)(x+y)^2(-x-y)^3=-(x+y)^6
原式=x²+xy-2y²+4x²-y²=5x²+xy-3y²
【x²+xy/(x-y)】/【xy/(x-y)】=【x²(x-y)/(x-y)+xy/(x-y)】/【xy/(x-y)】={【x²(x-y)+xy】/(x-y)}/【xy
(x-y)^2*(y-x)^2*(x-y)^6=(x-y)^2*(x-y)^2*(x-y)^6=(x-y)^10再问:能详细一点吗?我,初一的再答:(x-y)^2=(y-x)^2=(x-y)^2*(x
=(x+y)^4*(x-y)^6=(x^2-y^2)^4*(x-y)^2=x^10-2*(x^9)-5*(x^8*y^2)+8*(x^7*y^3)+2*(x^6*y^4)-12*(x^5*y^5)+2
(-x-2y)*(3x-y)=-3x^2-5xy+2y^2
[12(x+y)³(y-x)]³÷[4(x+y)²(x-y)]²=【12×12×12÷(4×4)(x+y)^9(y-x)^3】÷【(x+y)^4(x-y)^2】
16(x+y)^8/9(x-y)^8=16/9*[(x+y)/(x-y)]^8哪个好理解用哪个.再问:有过程没。。。再答:这个过程其实没什么好研究的。。。[3(x-y)^2(x+y)^-2/4(x+y
原式=(2x²+8xy-3xy-12y²)-(3x²-6xy+xy-2y²)=2x²+8xy-3xy-12y²-3x²+6xy-x
解代数式得:-3x的平方y-2y的三次方因为1/2的平方=-1/2的平方,所以结果仍正确给分吧!嘿嘿!
将第二三行分别加到第一行,第一行都为2*(x+y),提取,得2*(x+y)*{1,1,1;y,x+y,x;x+y,x,y};再将第一行分别乘以(-y)、(-x-y)加到二三行,得2*(x+y)*{1,
X-Y服从什么分布啊?一般不会有P(x-y再问:标准正态分布:x
x2+x+y-y2
解(x-y)/(xy-y²)=(x-y)/y(x-y)=1/y