方程1-2 x-1 x2=2x x2
来源:学生作业帮助网 编辑:作业帮 时间:2024/09/21 14:35:00
设(x²-1)/(x²+2x)=t则8t+3/t=118t²-11t+3=0(8t-3)(t-1)=0解得t=3/8或t=11.t=3/8(x²-1)/(x
由x+1x=2,两边分别平方得:x+1x=2,原式=1x+1x+3-1x+1x+9=55-1111.故答案为:55-1111.
后面的x²+11x-708有误吧!再问:没有题目就这样能不能帮我再答:那我就试试:原式为:1/x2+x+1/x2+3x+2+1/x2+5x+6+1/x2+7x+12+1/x2+9x+20=5
Xx2.25%x(1-20%)+x=814400.0225x×0.8+x=814400.018x+x=814401.018x=81440x=80000
2/(x2-x)+6/(1-x2)=7/(x2+x)2/x(x-1)-6/(x-1)(x+1)=7/x(x+1)[x*(x-1)*(x+1)]*[2/x(x-1)-6/(x-1)(x+1)]=[7/x
(1)原式=x(x+9)x(x+3)+(x+3)(x−3)(x+3)2=x+9x+3+x−3x+3=2(x+3)x+3=2;(2)原式=-x−2x−1÷x2−4x−1=-x−2x−1•x−1(x+2)
7x+2x=0.819X=0.81X=0.094(x-6)=36;x-6=9x=32x+0.2xX2=362.4x=36x=15
因为y=2xx2+1,所以函数的导数y'=f'(x)=2(x2+1)-2x⋅2x(x2+1)2=2-2x2(x2+1)2,所以f'(1)=2-24=0,即曲线在点(1,1)处的切线斜率k=0,所以曲线
因为3x2-3x=3(x2-1)x,所以原方程可变形为2y-3y=2.故答案为:2y-3y=2.
1x−1+1x+1+2xx2+1+4x3x4+1=2xx2−1+2xx2+1+4x3x4+1=4x3x4−1+4x3x4+1=8x7x8−1.故选D.
x2+x+1=2/(x2+x)(X²+x)²+(x²+x)-2=0(x²+x+2)(x²+x-1)=0∴x²+x-1=0x=(-1±√5)/
两边乘x(x+1)(x-1)2(x-1)+3(x+1)=4x2x-2+3x+3=4x5x+1=4xx=-1经检验,x=-1时分母x+1=0增根,舍去方程无解
(x²+x)(x²+x-2)=-1把(x²+x)看成整体(x²+x)[(x²+x)-2]=-1运用乘法分配率(x²+x)²-2(x
x²+x-1/(x²+x)=3/2两边同时乘以(x²+x)得:(x²+x)²-1=3(x²+x)/22(x²+x)²-3
(1)y=2x2+2xx2+1=2(x2+1)+2x−2x2+1=2+2(x−1)x2+1,令x-1=t,则x=t+1,t∈[-1,0],y=2+2tt2+2t+2,当t=0时,y=2;当t∈[-1,
(x-4)/(x²+x-2)=1/(x-1)+(x-6)/(x²-4)(x-4)/(x-1)(x+2)=1/(x-1)+(x-6)/(x-2)(x+2)(x-4)(x-2)=(x-
x²-2x=2x+1x²-4x=1x²-4x+4=5(x-2)²=5x-2=±√5x=2±√5
2x+0.2xX2=362x+0.4x=362.4x=36x=15
把题拍过来帮你解
已知方程,然后x=±√7