JZL500*700Y Ф8@200(4) B4Ф25 YФ12@150什么意思
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/08 22:37:49
移项、得1.5y=-3系数化为一、y=-2很简单的呀
(y²-y)²-8(y²-y)+12=(y²-y-2)(y²-y-6)=(y+1)(y-2)(y+2)(y-3)
-x^y^7+y^8)(这里有问题,x的几次方?再问:就是一次方再答:(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-xy^7+y^8)(x^2+xy+y^2)=(x^8-x^7y+x^
把y^2+2y看作整体=(y^2+2y-8)(y^2+2y+1)=(y+4)(y-2)(y+1)(y+1)
5y(8-y)-3y(5-3y)+2y(7-2y)>-3940y-5y²-15y+9y²+14y-4y²>-3939y>-39y>-1
y=-1.
2y+8y-1=2(y+4y+4)-1-8=2(y+2)-9=0所以(y+2)=2/9即y+2=√2/3或者-√2/3所以y=√2/3-2或者y=-√2/3-2
解2+8y+8y²=2(4y²+4y+1)=2(2y+1)²18-39x+18x²=18(x²-2x+1)=18(x-1)²80+5x
(y+4)/5+y+6=(y+8)/2-(y+4)/3乘以30得6(y+4)+30y+180=15(y+8)-10(y+4)6y+24+30y+180=15y+120-10y-406y+30y-15y
(x-y)^2+7(x+y)-11(x-y)^2-8(x+y),=-10(x-y)²-(x+y)当x+y=-3,x-y=-1时=-10*(-1)²-(-3)=-10+3=-7
6y-(y+2分之y+2-y分之y)除以y³-4y-2y²+8分之y=6y-[(2y-y²+2y+y²)/(4-y²)]÷y/(y-2)³=
1/(x-y)-1/(x+y)-2y/(x^2+y^2)-4y^3/(x^4+y^4)-8y^7/(x^8+y^8)=【(x+y)-(x-y)】/(x-y)(x+y)-2y/(x^2+y^2)-4y^
原式=(5-8)(x-y)^2-(1+3)(x-y)=-3(x-y)^2-4(x-y)
=-16x^2y^3+20x^2y^3=4x^2y^3
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y=(y^2-4x^2+4x^2+16xy+16y^2)/3y=(17y^2+16xy)/3y=17y/3+16x/32.(2(x-y)^3-
x+y/y=11/8说明11y=8(x+y)即8x=3y所以x-y/x+2y=3(x-y)/3(x+2y)=(3x-3y)/(3x+6y)=(3x-8x)/(3x+16x)=-5/19
用十字相交法来解再问:--~这是什么配方法什么十字相交法你会么?再答:点击[http://pinyin.cn/1tSJ9VCHZI4]查看这张图片。[访问验证码是:889841请妥善保管]再答:点击[
这是二阶微分方程特征方程a^2+a-2=0(a+2)(a-1)=0解得a=-2a=1所以y"+y'-2y=0的通解y=C1*e^(-2x)+C2*e^xC1C2为任意常数因为0+-2i不是方程的特征根