( )(3x-6y^3)=3(x^2-4y^6)()(3x-6y^3)=3(x^2-4y^6)用文字翻译即为:谁乘上3x减六倍的(y的三次方)等于三倍的[x的二次方减四倍的(y的六次方)]此为填空题.请高人快进来.(书后的答案是x+2y^3)我至今
来源:学生作业学帮网 编辑:学帮网 时间:2024/05/27 14:38:58
( )(3x-6y^3)=3(x^2-4y^6)
()(3x-6y^3)=3(x^2-4y^6)
用文字翻译即为:谁乘上3x减六倍的(y的三次方)等于三倍的[x的二次方减四倍的(y的六次方)]
此为填空题.请高人快进来.(书后的答案是x+2y^3)我至今不明白.
这道题目要用点技巧,不能直接用多项式相除的方法求解,其实考点是因式分
( )(3x-6y^3)=3(x^2-4y^6)
( )3(x-2y^3)=3(x+2y^3)(x-2y^3)
( )3(x-2y^3)=3(x-2y^3)(x+2y^3)
看出来了没有,要因式分解之后比较.
有边平方差公式,()*3*(x-2y^3)=3(x-2y^3)(x+2y^3)
所以得答案
( )(3x-6y^3)=3(x^2-4y^6)
设( )内为a,
则a=3(x^2-4y^6) /(3x-6y^3) 移项
=(x^2-4y^6 ) ./ (x-2y^3) 约分
注意:x^2-4y^6 = (x+2y^3)(x-2y^3) 公式A^2-B^2=(A+B)(A-B)
所有a = (x+2y^3)(x-2y^3) /(x-2y^3) = x+2y^3
满意请采纳哦
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
(x+y)/2- x-y/2=6 3(x+y)=4(x-y)
x+y/3+x-y/2=6 4(x+y)-2(x-y)=40
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
求值域 1,y=(x+2)/(x*x+3x+6) 2,y=3x/(x*x+4)
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
解二元一次方程组:3(x+y)-4(x-y)=4,x+y/2+x-y/6+1x+y/2+x-y/6+1=1
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
{x+y=1 ,xy=-6{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(x-y+2)(x+y)=0,x²+y²=8{(x+y)((x+y-1)=0,(x-y)(x-y-1)=0
2(x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
3(x+y)-2(x-y)=11 4(x+y)+3(x-y)=9
x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2
81/8*(-x-y)^6*(x-y)^3*4/9(x+y)^4*(y-x)^2
把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)= 3(x-y)把(x-y)看作一个整体,化解:5(x-y)+2(x-y)-4(x-y)=3(x-y)²-4(x-y)+7(x-y)-6(x-y)²=
4x-3y/x-2y÷6y-8x/y-2x