大师作文网计算(2x^2-3x^2y- 甲同学把哪个字
来源：学生作业帮助网 编辑：作业帮 时间：2024/09/22 17:24:50
(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=3x(xy-2x/y+2x²/3)+3x²y-3y³=3x²y-6x²/y+2x³+3x²y-3y³=2x
(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
(4x²y--9y)/(2x+3)=y(2x+3)(2x-3)/(2x+3)=y(2x-3)
（x+y）^2-(3x-2y)^2=x²+2xy+y²-(9x²-12xy+4y²)=x²+2xy+y²-9x²+12xy-4y&
(2x+y)(3x-2y)=2x*3x+y*3x-2x*2y-y*2y=6xx+3xy-4xy-2yy=6xx-xy-2yy
(-x-2y)*(3x-y)=-3x^2-5xy+2y^2
原式=3x-4y+(2y+x)-(x-3y)-6x=-3x-4y+(2y+x)-(x-3y)=-3x-4y+2y+x-x+3y=-3x+y
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
(2x+y)(x-3y)=2x(x-3y)+y(x-3y);y(x-3y)+y(x+3y)=2xy;所以2x(x-3y)+2xy=2x(x-3y+y)=2x(x-2y);2x(x-2y)÷(2x)=x
2x/(x^2-y^2)+3x/(y^2-x^2)+y/(x+y)(y-x)=2x/(x+y)(x-y)-3x/(x+y)(x-y)-y/(x+y)(x-y)=(2x-3x-y)/(x+y)(x-y)
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!
[(y-x)^3]*[(x-y)^m]-[(x-y)^(m+2)]*(y-x)=-[(x-y)^3]*[(x-y)^m]+[(x-y)^(m+2)]*(x-y)=-[(x-y)^(m+3)]+[(x-
原式=9x2-6xy+y2-4x2-4xy-y2+5xy-5x2=（9x2-4x2-5x2）+（-6xy-4xy+5xy）+（y2-y2）=-5xy．
(x-y)^7÷(y-x)^6+(-x-y)^3÷(x+y)^2=(x-y)^7÷(x-y)^6+[-(x+y)^3]÷(x+y)^2=(x-y)+[-(x+y)]=x-y-x-y=-2y
3x-2y-[-4x+(z+3y)]=3x-2y-(-4x+z+3y)=3x-2y+4x-z-3y=7x-5y-z
=12x^2-3xy+6x+4xy-y^2+2y-8x+2y-4=12x^2-y^2+xy-2x+4y-4