计算[(x+2y)^2-(x+y)(3x-y)-5y]/2x,其中x=-2,y=1/2

来源：学生作业帮助网 编辑：作业帮 时间：2024/10/06 21:59:29
计算[(x+2y)^2-(x+y)(3x-y)-5y]/2x,其中x=-2,y=1/2
x 0F^S-EDA@.(&84 V/D'ulf fZBI˙o2M@Sq]_HbF/X?17%ֿXO("*#2V(\iɧ$t|p9D /I2/nJcwv t`>(L*.XAeWO8U,7n4L#rx

计算[(x+2y)^2-(x+y)(3x-y)-5y]/2x,其中x=-2,y=1/2
计算[(x+2y)^2-(x+y)(3x-y)-5y]/2x,其中x=-2,y=1/2

计算[(x+2y)^2-(x+y)(3x-y)-5y]/2x,其中x=-2,y=1/2
[(x+2y)²-(x+y)(3x-y)-5y]/2x
=[(x²+4xy+4y²)-(3x²-xy+3xy+y²)-5y]/2x
=(-2x²+2xy+3y²-5y)/2x
=-x+y+3y²/2x-5y/2x
将x=-2,y=1/2代入上式得：
[(x+2y)²-(x+y)(3x-y)-5y]/2x
=2+1/2+(3/4)/(-4)+(5/2)/4
=47/16

5又8分之5

计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x 计算:(x+3y)(2x-y) 计算:(2x-3y)(x+y) 计算:(-x-2y) * (3x-y) 计算：(x+y)-3(x-2y). 计算(x+y)(x+y)^2(-x-y)^3 3x(x-y)+2y(x-y) 计算 计算：x+2y/x-y+2x/y-x-3y/x-y 计算2x/x-y 计算：x(x-3y)(5x-2y) 计算（2x-3y)(x+4y)-(3x+y)(x-2y)（2x-3y)(x+4y)-(3x+y)(x-2y) 计算:y-x分之x+y+x-y分之y-y-x分之2x-y 计算:y×(y/x)^3÷[-(x^2)/y]^-2 计算：y(x-y)^2+(y-x)^3=? 计算2x/x^2-y^2 3x/y^2-x^2 y/(x y)(y-x)快! 计算:(2x-3y)^2+(x-y)(x+y)+(2x+3y)^2 计算 ：(2x-y)(2x+y)-(3x-2y)(-3x-2y) [(2x+y)(x-3y)+y(x+3y)]÷(2x)计算,