3x 2.4x=10.8怎么样解方程?
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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
3/x2=1/x2-x即3*2-3x=x*22x*2=3Xx=0(舍去)x=3/2
(1)x2+4x+4=1+4,∴(x+2)2=5,∴x+2=±5,∴x1=5-2,x2=-5-2;(2)整理得2x(x+3)-(x+3)=0,∴(x+3)(2x-1)=0,∴x+3=0或2x-1=0,
等式两边同时乘以(x+3)(x-2)(x+2)就可以去分母了
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
(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-
将分数的分子,分母用括号括好.
2x+5x+3+4-x/2+2x+x-2=019x/2=-5x=-19/10检验:带入x是、原式=0
(x2-x)=3(x2+x)x2-x=3x2+3xx2-3x2-x-3x=0-2x2-4x=0-2x(x+2)=0x1=0x2=-2
1/(x²-5x+6)-1/(x²-4x+3)+1/(x²-3x+2)=1/(x-1)1/[(x-2)(x-3)]-1/[(x-1)(x-3)]+1/[(x-1)(x-2
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
设t=x²-x则原式可化为t²-4(2t-3)=0即t²-8t+12=0(t-2)(t-6)=0所以t1=2,t2=6即x²-x=2或者x²-x=6解
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
解方程:x2-6x+2x2-6x=3x2-3x-3-9x=-3x=1/3解不等式:2x3-6x2+4x2-4x≥2x3-2x2+5x-39x-3≤0x≤1/3
原式=[x+2x(x-2)-x-1(x-2)2]÷x2-16x2+4x=[x2-4x(x-2)2-x2-xx(x-2)2]÷x2-16x2+4x=x-4x(x-2)2•x(x+4)(x+4)(x-4)
(x^2+2x)^2-4(x^+2x)+3=0[(x^2+2x)-3][(x^2+2x)-1]=0[x^2+2x-3][x^2+2x-1]=0(x-1)(x+3)(x^2+2x-1)=0剩下的你解没问
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
去分母,x^2-5x=0∴x(x-5)=0x1=0(增根,舍去),x2=5圆柱的嘛.高=100/2πR∴底面积=πR^2∴πR^2*100/2πR=250解得R1=0(舍)R2=5额,怎么答案那么熟…
方程的左边:(x2-3x+2)(x2+3x-2)=[x2-(3x-2)][x2+(3x-2)]=[x4-(3x-2)2]=x4-9x2+12x-4方程的右边:x2(x+3)(x-3)=x2(x2-9)