当x=2倍根号2时,求根号x^2-6x
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代数式x²-2x+1/x²-1÷2x-2/x+1 =(x-1)²(x+1)÷2(x-1)(x+1)(x-1) =(x-1)²(x+1)÷2(x+1)(x-1
将X=2-根号3带入代数式,原式得:=(7+4根号3)(7-4根号3)+(2+根号3)(2-根号3)+根号3=1+1+根号3=2+根号3
对f(x)进行变换:f(x)=(√x+2-√x+1)-(√x+1-√x)=1/(√x+2+√x+1)-1/(√x+1+√x)=-(√x+2-√x)/[(√x+2+√x+1)*(√x+1+√x)]=-2
由√x(√x-√y)=√xy+3y,得x-2√xy-3y=0,(√x-3√y)(√x+√y)=0,上式要成立,就只能:(√x-3√y)=0或(√x+√y)=0,解得x=9y(x>0时)或x=y=0.你
被开方数要大于等于0,才有意义根号2x,2x≥0,x≥0才有意义根号-x,-x≥0,x≤0才有意义根号x²,无论x取何值,x²≥0,无论x为何值都有意义
您好:三分之二倍根号9X+6倍根号4分之X-2X乘以根号X分之一=152√x+3√x-2√x=153√x=15√x=5x=25如果本题有什么不明白可以追问,如果满意请点击“选为满意答案”如果有其他问题
解√(x²-6x+9)×√(x²+6x+9)=√(x-3)²×√(x+3)²=√[(x-3)(x+3)]²=√(x²-9)²=√(
2√2x-√6=√2x+2√22√2x-√2x=√6+2√2√2x=√6+2√22x=(√6+2√2)²=6+4√12+8=14+8√3x=7+4√3(7-4√3)x²+(2-√3
x-8>=08-x>=0∴x=8把x=8代入Y=根号X-8+根号8-X在加18得y=18X-Y/根号X-根号y再减去2xy/x倍根号y-y倍的根号x=(√x+√y)-2√(xy)/(√x-√y)=(2
原式=[(√x-√y)²+(√x+√y)²]/(√x+√y)(√x-√y)=(x+y-2√xy+x+y+2√xy)/(x-y)=2(x+y)/(x-y)=2(2+√3)/(2-√3
x+y-2倍根号xy=(根号x-根号y)^2=(22-1.6)^2=416.16根号x-根号y=22-1.6=20.4
令y=2√x,y’=3-1/x大致做两条曲线(仅变化趋势)两直线交点是x=1处的点由此可证明
x=(√3+√2)/(√3-√2)=(√3+√2)²=5+2√6y=(√3-√2)/(√3+√2)=(√3-√2)²=5-2√6∴x²+y²-5xy=x
((x-y)/(√x+√y))-(x+y-2√xy)/(√x-√y),分母有理化,第一个式子分母乘以√x-√y,又(x+y-2√xy)=(√x-√y)(√x-√y),所以原式等于√x-√y-(√x-√
原式=(x+y)/(√x-√y)-(2xy)/(x√y-y√x)=(x+y)/(√x-√y)-(2xy)/[√(xy)(√x-√y)]=(x+y)/(√x-√y)-2√(xy)/(√x-√y)]=[(
令√x+1=tt≥1则x=(t-1)²①将①式代入原方程得f(t)=(t-1)²+2(t-1)=t²-1∴f(x)=x²-1x≥1
x=4084y=1/9所以√x=2√y=1/3原式=4*(1/2)-2/3-9*y√y=2-2/3-1/3=1
√x(√x+√y)=3√x(√x+5√y)?错了吧应该是√x(√x+√y)=3√y(√x+5√y)x+√(xy)=3√(xy)+15yx-2√(xy)-15y=0(√x-5√y)(√x+3√y)=0x