已知x+y=5,x-y=3,求:x^2-y^2 x^2+y^2 xy的结果
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/01 12:24:36
已知x+y=5,x-y=3,求:x^2-y^2 x^2+y^2 xy的结果
已知x+y=5,x-y=3,求:x^2-y^2 x^2+y^2 xy的结果
已知x+y=5,x-y=3,求:x^2-y^2 x^2+y^2 xy的结果
x^2-y^2 =(x+y)(x-y) =5*3 =15 x^2+y^2 =1/2(x+2xy+y+x-2xy+y)] =1/2[(x+y)+(x-y)] =1/2(25+9) =17 xy =1/4[(x+2xy+y)-(x-2xy+y)] =1/4[(x+y)-(x-y)] =1/4(25-9) =4
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
已知:3x-5y=0,求x/y,x-y/y,x-y/x
已知|x|=2,|y|=3,|x+y|=-(x+y)求x-y
已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值
已知3x =2y 求x/x+y+y/x-y-y²/x²-y²
已知2x-y=-3,求代数式5(x-3y)-2(x-7y)
已知5|x+y-3|+(x-2y)²=5,求x+y的值
已知3x-2y/x+y=5/3求x；y的值
已知x+y/3x-2y=5/3求x；y的值
已知x,y>0 2x+y+3=xy 求5x+4y最小值
已知2y-x=-3,求[4y(2x-y)-2x(2x-y)]/(2x-y
已知7x+5y/2y-x=3/2,且x≠0,求X/x-4y
1.已知:x-2y=3,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除4x 的值
已知x-2y=2011,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷4x的值.
已知x-2y=2016,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以8x的值
已知x-2y=2012,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]/(8x))
已知x-2y=2010,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷8x的值
已知:x-2y=2009,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以8x 的值