化简：(x-y)^2-y(3y-2x),其中x=根号5,y=-根号2

来源：学生作业帮助网 编辑：六六作业网 时间：2024/11/28 01:10:58
化简：(x-y)^2-y(3y-2x),其中x=根号5,y=-根号2化简：(x-y)^2-y(3y-2x),其中x=根号5,y=-根号2化简：(x-y)^2-y(3y-2x),其中x=根号5,y=-根

化简：(x-y)^2-y(3y-2x),其中x=根号5,y=-根号2
化简：(x-y)^2-y(3y-2x),其中x=根号5,y=-根号2

化简：(x-y)^2-y(3y-2x),其中x=根号5,y=-根号2
(x-y)^2-y(3y-2x)
=x^2+y^2-2xy-3y^2+2xy
=x^2-2y^2
=5-4=1

(x-y)^2-y(3y-2x)
=x^2-2xy+y^2-3y^2+2xy
=x^2-2y^2
=5-2×2
=5-4
=1

(x-y)^2-y(3y-2x)=x^2+y^2-2xy-3y^2+2xy=x^2-2y^2
x=根号5，y=-根号2
上式=5-2*2=1

(x-y)^2-y(3y-2x)
=x²-2xy+y²-3y²+2xy
=x²-2y²
=(√5)²－2×(-√2)²
=5－2×2
=5－4
=1

原式=x^2-2xy+y^2-3y^2+2xy
=x^2-2y^2
因为x=根号5，y=-根号2
所以5-4=1

化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方 化简y(x+y)+(x+y)(x-y)-x^2 化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x 化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x 化简:5(x-y)+2(x+y)-3(x-y) 化简3(x-y)-7(x--y)+2(y-x) (x+y)-(x-y)^3÷(x-y)(x+y)×2y化简e , 化简(X-2Y)-(Y-3X) 化简：[(x+y)(x-y)(x+y)^2-2y(x-2y)](-2y) 谢谢! x(x-y)2-(y-x)3 (2x+3y)(3x-2y)-(x-2y)(x+2y)化简 化简 [(x-y)^2(x+y)^-2/2(x+y)^2(x-y)^-2]^-3 化简(x-3y)(3x+y)-(2x-3y)(2x-3y) 化简：[(x+2y)^2-(x+y)(3x-y)-5y^2]/2x (2x+3y)(x-2y)-(y+2x)(2x-y) 化简 化简(2x+3y)(x-y)-(y+2x)(2x-y) [(x-2y)²+(x+y)(3x-y)-3y²]÷2x化简。 化简:(x-y)(x-2y)+(x+2y)(x-3y)