先化简在求值【(2y-3x)(-3x-2y)-(-3x+y)²-2y/3(3x-y+3xy²)】÷(
来源:学生作业帮 编辑:大师作文网作业帮 分类:综合作业 时间:2024/09/23 06:29:49
先化简在求值【(2y-3x)(-3x-2y)-(-3x+y)²-2y/3(3x-y+3xy²)】÷(-4y)其中x=-2 y=-3
【(2y-3x)(-3x-2y)-(-3x+y)²-2y/3(3x-y+3xy²)】÷(-4y)
=【9x²-4y²-(9x²-6xy+y²)-(2xy-2y²/3+2xy³)】÷(-4y)
=【9x²-4y²-9x²+6xy-y²-2xy+2y²/3-2xy³】÷(-4y)
=(-13/3y²+4xy-2xy³)÷(-4y)
=13/12y-x+1/2xy²
=13/12×(-3)-(-2)+1/2×(-2)×(-3)²
=-13/4+2-9
=-13/4-7
=-41/4
=【9x²-4y²-(9x²-6xy+y²)-(2xy-2y²/3+2xy³)】÷(-4y)
=【9x²-4y²-9x²+6xy-y²-2xy+2y²/3-2xy³】÷(-4y)
=(-13/3y²+4xy-2xy³)÷(-4y)
=13/12y-x+1/2xy²
=13/12×(-3)-(-2)+1/2×(-2)×(-3)²
=-13/4+2-9
=-13/4-7
=-41/4
先化简在求值(x+y)²-(x-y)(x+y)-(xy)²÷(xy),其中x,y是方程组『3x+2y
先化简在求值【(2y-3x)(-3x-2y)-(-3x+y)²-2y/3(3x-y+3xy²)】÷(
先化简,再求值:{xy(x²-3y)+3xy²}(-2xy)+x³y²(2x-y
先化简,在求值:(x-y)²+(3x-2y)(2x+y)-x(6x-y)
急![(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
先化简,在求值;(x的平方-y的平方/x的平方-2xy+y的平方)+[3x+xy/x(y+3)],其中x=2,y
化简求值[1-(2x/x+y)]÷ (x²-2xy+y²/3x+3y)+(x²+xy/x&
先化简在求值:(-1/3XY)²×[xy(2x-y)-2x(xy-y)²],其中X=-3/2,Y=2
先化简在求值:(-1/3XY)²×[xy(2x-y)-2x(xy-y)²],其中X=-3/2,Y=-
先化简再求值{(x-y)(x+y)-(x+y)(x-2y)}/y 其中xy的值是代数式{(3x-2y-7)^2+|2x+
先化简,再求值:(3x-y)²+(3x+y)(3x-y),其中x=1,y=-2
化简求值:(2x²y-2xy²)-【(-3x²y²+3x²y)】,其中