5xy[-15xy 2x]计算-搜答案-拍题作业网

[5xy^2(x^2-3xy)-(-3x^2y^2)^3]/(5xy^2)=[5xy^2(x^2-3xy)+27x^6y^6]/(5xy^2)=5xy^2(x^2-3xy)/(5xy^2)+27x^6

（1）（7-3x)+(5x-6)=7-3x+5x-6=1+2x(2)-(x^2-3)-(7-5x^2)=-x²2+3-7+5x²=4x²-4(3)xy-(3x-2xy)+

x^3*y^3就这个把

1.x^4+5x^2-6=(x^2+6)(x^2-1)=(x^2+6)(x-1)(x+1)2.(x+y)(x+y+2xy)+(xy+1)(xy-1)=(x+y)^2+2xy(x+y)+(xy+1)(x

根据题意，分式xy2x+3y中的x，y都扩大5倍，∴5x•5y2×5x+3×5y=25xy10x+15y=5xy2x+3y；即分式的值是原式值的5倍．故选B．

3xy[2xy-x(y-2)+x-1]=3xy(2xy-xy+2x+x-1)=3xy(xy+3x-1)=3x^2y^2+9x^2y-3xy

[5xy²(x²-3xy)-(-3x²y²）³]÷（-5xy）²=（5x^3y²-15x²y^3+27x^6y^6）÷2

[5xy²（x²-3xy）+（3x²y²）³]÷（5xy）²=(5x³y²-15x²y³+27x^6

把分式xy2x

xy2x2−18=xy2(x+3)(x−3)=x2(x+3)•yx−3（答案不唯一）

这题少括号了吧.

(5-xy/x^3-x^2y)/(1-5/xy)^2*(y-x)^3=-(x-y)^3[-(xy-5)/x^2(x-y)]/[(xy-5)/xy]=(x-y)^3(xy-5)xy/x^2(x-y)(x

[5xy的平方（x的平方-3xy）+（3x的平方y的平方）的三次方]/(5xy)的平方=（5x³y²-15x²y³+27x的6次方y的6次方）/25x²

x-3y+(27x^4y^4)/5

[(5xy^2(x^2-3xy)-(-3x^2y)^2]/2x^2y^2=[5x^3y^2-15x^2y^3-9x^4y^2]/2x^2y^2=5x^3y^2/2x^2y^2-15x^2y^3/2x^

{4x（2xy-3xy的平方）-3x平方y（4x-5y）}÷（-0.5xy）={4x²y(2-3y)-3x²y(4x-5y)}÷(-0.5xy)=x²y[8-12y-12

1、去括号得：-(xy^2)^3(xy^2)^2xy^2=-(-3)^3(-3)^2-3=279-3=332、图形是不是像＂回＂这样?如果是,就直接用大长方形的面积减去小长方形的面积,即：S=(2a-

计算 [-(xy)²]³

[-(xy)²]³=-x^6*y^6

原式=12xy+3x2-5xy-6xy-4x2，=xy-x2．

因为：x+y=2xy所以：（4x-5xy+4y)/(xy-x-y)=[4(x+y)-5xy]/[xy-(x+y)]（构造）=（4*2xy-5xy）/(xy-2xy)（等量代换）=3xy/-xy=-3希