5xy[-15xy 2x]计算
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[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
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-
[-(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