已知y=x的平方 px p,当x=1时,y的值为2,当x=-1时,y的值为2
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(x-y)²=x²+y²-2xy=x²+y²+2xy-4xy=(x+y)²-4xy=7²-2[(x+y)²-x²
(x平方+y平方)平方-y平方=x平方+6所以(x²+y²)²-(x²+y²)-6=0(x²+y²+2)(x²+y
题目不对应该是ax5次方y=ax^5+bx³+cx-1则x=-3y=-a*3^5-b*3³-3c-1=-5-(a*3^5+b*3³+3c)=-4a*3^5+b*3
y=ax^2+bx+ca+b+c=6a-b+c=29a+3b+c=34这个就是3元一次方程,解得a=3b=2c=1;这样x=-3时y=22
y=a(x+m)^2-12=am^2-27=a(1+m)^212/27=m^2/(1+m)^24/9=m^2/(1+m)^2m=2或-2/5a=-3或-75y=-3(x+2)^2y=-75(x-2/5
x=-3y=4式子等于-49/12
已知5x-4y=0,切xy≠0,x/y=4/5;求(x平方-y平方)分之(x平方+y平方)-(x-y)分之(x+y)的值=(x²+y²)/(x²-y²)-(x+
两式子相加相减得(X+Y)的平方=16X方-Y方=12题一解为4题二解为4
x²+y²=25x+y=7(x+y)²=49x²+y²+2xy=492xy=49-25=24(x-y)²=(x+y)²-4xy=7
y=1/2(x^2-6x)+16y=1/2(x^2-6x+9-9)+16=1/2(x-3)^2+11.5x=3,
x+1/x=4=>x=2-3^0.5=>x^2=4x-1;x^2+1=4x=>x^4+x^2/(1+x^2)=(4x-1)^2+x^2/(4x)=16x^2-8x+1+x/4=16(4x-1)-8x+
由x+y=25x+y=7则(x+y)=x+y+2xy=7=492xy=(x+y)-(x+y)=49-25=24则(x-y)=x+y-2xy=25-24=1因为:x<y所以x-y<0即x-y=-1
将(0,-12)(1,-27)代入函数数方程-12=a(0-h)^2得a=-12/(h)^2代入-27=a(1-h)^2化简得:5h^2+8h-4=0(5h-2)(h+2)=0h=2/5或h=-2a=
x平方+xy-2y的平方=0,(x-y)(x+2y)=0x-y=0或x+2y=0x=y或x=-2yx/y-y/x-x的平方+y的平方/xy=(x²-y²-x²-y
{(x的平方+y的平方)-(x的平方-y的平方)+2y(x-y)}除4y=(2y^2+2y(x-y)/(4y)=2xy/(4y)=x/2
当x0所以f(-x)=x'2+2x+3,因为f(x)是奇函数,所以f(x)=-f(-x)=-x'2-2x-3即当x
原式=-2xyz=-2*-1*-2*-3=12
x的平方+y的平方-2x+4y=-5x²-2x+1+y²+4y+4=0﹙x-1﹚²+﹙y+2﹚²=0x-1=0,y+2=0x=1,y=-2
1设Y=aX²将X=根号2,Y=6代入,解得a=3所以,Y=3x²2将Y=12代入Y=3X²得12=3X²解得X=正负2
y=x的平方-3x+2,当x=(1或2)时,y的值为0;当x=(4或-1)时,y的值为6x²-3x+2=0(x-2)(x-1)=0x1=2x2=1x²-3x+2=6x²-