y=x²+(1-a)x+1是关于x的二次函数,当x的取值范围是1≤x≤3时,y在x=1是取得最大值,则实数a的取值范围是( )A,a=5 B,a≥5 C,a=3 D,a≥3
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简单线性规划 在线等~!1. 已知x,y满足{x+3y-3≤0, {x≥0, 则z=(y+2)/(x-1)的取值范围是? {y≥0, 2.已知集合A={(x,y)||x|+|y|≤1},B={(x,y)|x²+y²≤1},C={(x,y)||x|≤1,|y|≤1},则A,B,C的关
两圆x²+y²=1和圆(x+4)²+(y-a)²=25相切,则常数a的值是
解方程,什么是换元法啊,用换元法解方程8(X²+2X)/X²-1 + 3(X²-1)/X²+2X=11时,若设X²-1/X²+2X=Y,则可得到关于Y的整式方程是A 3Y²-11Y+8=0 B 3Y²+8Y-11=0 C 8Y²-11Y+3=0 D 8Y²+3Y-11
1(x-3x-1)(x+3y-1)2(3x-2y+1/4)²3(a+b)²-(a-b)²4 [2x²-(x+y)(x-y)][(-x-y)×(y-x)+2y²],其中x=1 y=25[(0.5x-y)²+(0.5x+y)²](0.5x²-2y²)6(a+3b)²-2(a+3b)(a-3b)+(a-3b)²7
已知x=acosα,y=bsinα,求证x²/a²+y²/b²=1
一些数学题,x(x-y)²-(y-x)y分解公因式已知a²+2a-2=0,则a³+4a²+2a+6的值是分解因式-0.01t²+s²(m-n)³+(n-m)m²(a-b)²-a(b-a)+4若x²-x-m=(x-m)(x+1),则m的值为若a²b²+a²+b&s
约分:(1)x²-y²/ax-by+ay-bx(2)x²-y²-9-2xy/x²-y²+6x+9通分:(1)b/2a ,c²/3b ,1/4abc(2)2x/x²-9 ,x+2/x²+5x+6已知1/x - 1/y=2,求3x+xy-3y/y-xy-x的值求求大家了,这是我今天的作业!约分:(1)
x⁴-a²x²-b²x²+a²b²x²(x+1)-y(xy+x)
二次函数y=ax²+x+a²-1的图像可能是
1.(x²-2x+1-y²)/(x+y-1)=2.a²+2ab+b²+(a-2)²=0,则b=( )
利用乘法公式计算(x+y)(x²+y²)(x-y)(x的四次方+y四次方)(a-2b+3)(a+2b-3)[(x-y)²+(x+y)²](x²-y²)(m-n-3)²先化简,再求值[(a-1/2)²-(a+1/2)²](a+3),其中a=-2
xy²/(x²y) - y×x²/(x²+x)=(x²-3x)/(x²-5x×2x) - 10/(x²-6x+9)=2a/(a²-4) - 1/(a-2)=2/(1-a ) - 1/(a-1)=x²-1/(x²-x-2)除以x/2x-4,其中x=1/2[x-x/(x+1)]除以[x/(2x-4)] ,其中x=√2+1
几道初二计算题1、2(x-1)²-(x+2)(x-2)2、[x(x²y²-xy)-y(x²-x³y)]÷3x²y3、分解因式 4a²-b²-2bc-c²4、已知x+y=6,xy=8,求x²+y²的值好久没做了
例如:a²+b²-c²-4d²-2ab+4cd x²+2xy+y²-2x-2y+1=0
已知A=2x²-5xy+2y²+x-2y,B=x²-5/2xy+y²-2x+y,且A-2B=3a,|x-a|+(y-1)²=0
1,多项式27m²n²+18m²n²-36mn的公因式是( )2,若x²+x+a=(x+b)²,则a=( )b=( )3,(2a-3b)²=(2a-3b)²+( )4,已知(x+y)²=3,(x-y)²=2,则x²+y²+6xy=( )
①.X²-2X+1/X²-1 ÷ X²-X/X+1②.a-1/a²-4a+4 ÷ a²-1/a²-4③.x³-x²/x²-x ÷ x²-2x/x-1④.(x-y)²/x+y ÷ 1/y+x X 1/x-y帮下忙嘛 咯
1·已知a+b+c=0且a²+b²+c²=1,求ab+bc+ac的值.2·已知x,y满足等式x²+y²-4x+y+17/4=0,求(x+y)²的值.3·已知x+y=5,x²+y²=13,求代数式x²y+2x²y²+xy²的值.4·若a²+b²+