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解方程:1/(x+2)%1/(x+3)%1/(x+4)+1/(x+5)=0

这道题要求计算能力很强 3/x+1/(x-1)+4/(x-2)+4/(x-3)+1/(x-4)+3/(x-5)=0 [3/x+3/(x-5)]+[1/(x-1)+1/(x-4)]+[4/(x-2)+4/(x-3)]=0 (6x-15)/(x^2-5x)+(2x-5)/(x^2-5x+4)+(8x-20)/(x^2-5x+6)=0 (2x-5)[3/(x^2-5x)+1/(x^2-5x+4)+4/(x^2-5x+6)]=0 所...

最后等于48你写漏了吧? (x-1)(x-2)(x-3)(x-4)=48 [(x-1)(x-4)][(x-3)(x-2)]=48 (x^2-5x+4)(x^2-5x+6)=48 (x^2-5x)^2+10(x^2-5x)+24=48 (x^2-5x)^2+10(x^2-5x)-24=0 (x^2-5x+12)(x^2-5x-2)=0 (十字相乘分解 x^2-5x看成整体 ) x^2-5x+12...

解:3(x+2)=4(x+1) 3x+6=4x+4 4x-3x=6-4 x=2 希望能够帮助你

1/2(x-1/2(x-1)-1+2)=2/3(x-1) {将“+1”变为“-1+2”} 1/2((x-1)-1/2(x-1)+2)=2/3(x-1) → 1/2(1/2(x-1)+2)=2/3(x-1) 1/4(x-1)+1=2/3(x-1) {去括号} 5/12(x-1)=1 {移项,合并同类项} x-1=12/5 x=17/5=3.4

(x+1.2)÷4=1.5 解:x十1.2=6 X=4.8

2(x+1)/3=5(x+1)/6-1 2[2(x+1)]=5(x+1)-6 4x+4=5x+5-6 4-5+6=5x-4x 5=x x=5

4(x-2)=x+1 4x-8=x+1 4x-x=1+8 3x=9 x=9÷3 x=3 很高兴为您解答,祝你学习进步!如果有其他问题请另发或点击向我求助,请谅解,谢谢! 有不明白的可以追问!如果您认可我的回答。请点击下面的【选为满意回答】按钮。

(X+1)/(X-1)-4/(X²-1)=1 两边同乘以(X²-1),得 (x+1)²-4=x²-1 2x-3=-1 x=1 检验知x=1是增根 所以,原方程无解

x-3/x-2+1=3/2-x 乘以(x-2)得 x-3+(x-2)=-3 x-3+x-2=-3 移项得 x+x=-3+3+2 合并同类项得 2x=2 x=1 经检验x=1是原方程的解

解: y=1/x+4/(1-x) =(1-x+4x)/x(1-x) =(3x+1)/x(1-x) 令t=3x+1 x=(t-1)/3 f(t)=t/[(t-1)/3*(4-t)/3] =9t/(t-1)(4-t) =9t/(4t-4-t^2+t) =9t/(-t^2+5t-4) =9/(-t-4/t+5) ≥9/(-2√4+5) =9/(-4+5) =9 ∴最小值为9

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