3(x 2.1)=10.5怎么解方程
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![3(x 2.1)=10.5怎么解方程](/uploads/image/f/273390-6-0.jpg?t=3%28x+2.1%29%3D10.5%E6%80%8E%E4%B9%88%E8%A7%A3%E6%96%B9%E7%A8%8B)
令a=x+1/x两边平方a²=x²+2+1/x²所以x²+1/x²=a²-2所以2(a²-2)-3a-1=02a²-3a
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
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
x2+3x2+1=0中的3x2表示什么?再问:已知X2+3X+1=0,求X2+1/X2的值?得数是7。求过程?我打的是X的平方。怎么会出X2、再答:答:因为x≠0,两边都除以x得:x+1/x=-3,两
1.令t=x+1/x则t^2=x^2+1/x^2+2代入方程:2(t^2-2)-3t-1=02t^2-3t-5=0(2t-5)(t+1)=0t=5/2,-1当t=5/2时,由x+1/x=5/2得x=2
令a=(x²+1)/x则x/(x²+1)=1/aa+2/a=3两边乘aa²-3a+2=0(a-1)(a-2)=0a=1,a=2(x²+1)/x=a=1x&sup
3/x2=1/x2-x即3*2-3x=x*22x*2=3Xx=0(舍去)x=3/2
x^2-3x-1=0a=1b=-3 c=-1△=b^2-4ac=3^2-4*-1=13两个根为,所以X1=(3+根号13)/2 X2=(3-根号
方程两边同时乘以x(x+1)(x-1)得:5(x-1)+3(x+1)=7x解得:x=2检验:x(x+1)(x-1)=6所以x=2是原分式方程的解
原式可化为1/(x+1)(x-3)+2/(x-3)((x+2)+3/(x+1)(x+2)=0两边同乘以:(x+1)(x+2)(x-3)得:(x+2)+2(x+1)+3(x-3)=0(x≠-1,x≠-2
7/(X2+X)+3/(X2-X)=6/(X2-X),去分母,等式两端同时乘X(X+1)(X-1):7(X-1)+3(X+1)=6(X+1),7X-7+3X+3=6X+6,7X+3X-6X=6+7-3
用短除法或二分法.
(2x^2-4x-3)/(x^2-2x-1)-3=0{(2x^2-4x-3)-3(x^2-2x-1)}/(x^2-2x-1)-=0{-x^2+2x}/(x^2-2x-1)=0-x(x-2)/(x^2-
(2x+1)(3x2+5x+7)=(3x-1)(2x2+5x+7)6x3+10x2+2x+3x2+5x+1=6x3+15x2+21x-2x2-5x-76x3+13x2+7x+1=6x3+13x2+16
7/(x+x2)-3/(x-x2)=6/(x2-1)两边同乘以x(x+1)(x-1),得7(x-1)+3(x+1)=6x7x-7+3x+3=6x10x-6x=3-74x=-4x=-1经检验x=-1是增
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-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
通分:(x^2-3x)+(2x-1)(x+1)=0化简:3x^2-2x-1=0x1=1(舍去,分母不为0)x2=-1/3
令(x^2-1)/x=t3/t+t/2=5/2t^2-5t+6=0t=2或t=3即:(x^2-1)/x=2或(x^2-1)/x=3x^2-2x-1=0或x^2-3x-1=0x=1±√2或x=(3±√1
2x-3x=1-x=1x等于-1