对于3x的平方-6x 4,当x为何值时,代数式有最大值
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x^2+2x-2=(V2)^2+2V2-2=2V2x^2+2x-2=(x+1)^2-3=(V3-1+1)^2-3=3-3=0
x=x分之1,x^2=1,x=±1x4次方+x平方-6除以x平方+3=1+1-6+3=-1
x²-13x+1=0两边除以xx+1/x=13两边平方可得x²+1/x²+2=169x²+1/x²=167两边平方可得x^4+1/x^4=167&su
x^2-3x+1=0x^2+1=3x两边同除以xx+1/x=3x^2+1/x^2=(x+1/x)^2-2=9-2=7x^4+1/x^4=(x^2+1/x^2)^2-2=49-2=47
x^2-3x+1=0x^2+1=3x同时除以xx+1/x=3所以x^2+1/x^2=(x+1/x)^2-2=3^2-2=7x^2/(x^4+x^2+1)=1/(x^2+1+1/x^2)=1/8
4x^2+(6x^3-12x^4)/(3x^2)=4x^2+3x^2(2x-4x^2)/(3x^2)=4x^2+2x-4x^2=2x
(x²+x)/(x^4-3x²+1)=(x^-2+x^-3)/(1-3x^-1+x^-4)当x趋于无穷大时,上式=0/1=0
(x平方-2x+3)/(x平方-3x+2)=1x²-2x+3=x²-3x+2x²-2x-x²+3x=2-3x=-1∴当x=-1时,分式(x平方-2x+3)/(x
x²-3x+1=0两边同除以x得x-3+1/x=0即x+1/x=3x平方/x4次方+x平方+1这里分母是x4次方,则x平方/x4次方+x平方+1=1/x²+x²+1=﹙x
根据题意得:当x+2≠0时,x≠-2∴当x≠-2时,分式有意义当x²-4=0,x+2≠0x²=4x≠-2x=±2∴x=2∴,当x=2时,分式的值为0手打出来的哦!
当1小于等于X小于等于3,函数F(X)=X的平方+6X=(x+3)²-9;∵-1≤x≤3;∴x=-1时;最小值=4-9=-5;x=3时;最大值=36-9=27;值域为[-5,27]很高兴为您
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+
当x=3时,ax的5平方+bx的3平方+cx+8=a*3^5+b*3^3+3c+8=69a*3^5+b*3^3+3c=69-8=61当x=-3时,ax的5平方+bx的3平方+cx+8=a*(-3)^5
x^2-3x+1=0x^2+1=3xx+1/x=3(x+1/x)^2=9x^2+1/x^2+2=9x^2+1/x^2=7(x^2+1/x^2)^2=49x^4+1/x^4+2=49x^4+1/x^4=
x⁴+2x³+4x²+3x+2=x⁴+x³+x²+x³+x²+x+2x²+2x+2=x²(x
(x4+x2+1)/x2=x2+1+1/x2=(x+1/x)^2-2+1=9-1=8所以所求=1/8(x4=x^4,凑合看)
解(x-x²-5)-(-2x²+x-3)=x-x²-5+2x²-x+3=(2x²-x²)+(x-x)+(3-5)=x²-2∵x=2
6X^2-7xy-3y^2-x+7y-2=6x^2-(7y+1)x-(3y^2-7y+2)=6x^2-(7y+1)x-(y-2)(3y-1)=[2x-(3y-1)][3x+(y-2)]=(2x-3y+
x平方-3x+1=0二边同除以xx-3+1/x=0x+1/x=3x^2+1/x^2=(x+1/x)^2-2=3^2-2=7x^4+1/x^4=(x^2+1/x^2)^2-2=7^2-2=47
这是一个数学表达式啊!你要问什么啊?