解方程x² 2x-3=5-搜答案-神马作文网

(x+3)/(x+2)+(x+9)/(x+8)=(x+5)/(x+4)+(x+7)/(x+6)1+(x+5)/(x+2)(x+8)=1+(x+5)/(x+4)(x+6)x=-5再问：第二步那个1是怎么

2（x-2)(x+3)-(2x-5)(x-1)=3x+72（x²+x-6）-（2x²-7x+5）=3x+72x²+2x-12-2x²+7x-5=3x+79x-1

解方程2x+3x+5x=32

2x+3x+5x=3210x=32x=3.2

((X-2)(X-4)-(X-3)^2)/(X-3)(X-4)=((X-5)(X-7)-(X-6)^2)/(X-6)(X-7),-1/(X^2-7X+12)=-1/(X^2-13X+42),6X=30

x(2x-4)+3x(x-1)=5x(x-3)+82x²-4x+3x²-3x=5x²-15x+88x=8x=1

我给个思路吧（X+2-1/X+2)-(X+3-1/X+3)=（X+6-1/X+6)-(X+7-1/X+7)1-1/(X+2)-1+1/(X+3)=1-1/(X+6)-1+1/(X+7)剩下的就自己解决

x1=1/3(10-7(2/(1357-9√[22717]))^(1/3)-(1/2(1357-9√[22717]))^(1/3));x2=10/3+1/6(1+i√[3])(1/2(1357-9√[

原式5/X（X-2）-4/X（X+2）=3/X²-45（X+2）/X(X-2)(X+2)-4(X-2)/X(X-2)(X+2)=3/X²-4(5X+10)/X-(4X-8)/X=3

2x+4x+6x...+100x=1-(x+3x+5x+...+99x)x(2+4+6+...+100)=1-x(1+3+5+...99)x(2+4+6+...+100)+x(1+3+5+...+99

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

通分化简得到(x+1)(x+2)=(x+5)(x+6)3x+2=11x+308x=-28x=-7/2

两边乘x(x+3)(x-3)2x³+3x²--27x-x²-3x=5x³-45x-3x³+2x²+27x-18-27x-3x=-45x+27

首先由题意得x+1≠0,x+7≠0,x+5≠0,x+3≠0,即x≠-1,x≠-7,x≠-5,x≠-3,则先简化方程(x+1+1)/(x+1)+(x+7+1)/(x+7)=(x+5+1)/(x+5)+(

2(x-3)(x+5)=x^2+(x+2)(x-2)+(x+7)2(x^2+2x-15)=x^2+x^2-4+x+72x^2+4x-30=2x^2+x+33x=33x=11

这个展开就行了哇.2*（x^2+x-6）-(2*x^2-7X+5)-3x-7=0化简得：6X=24x=4应该是对的.嘿嘿.

(x+1)(x-3)=2x+5x²-2x-3=2x+5x²-4x=8x²-4x+4=8+4(x-2)²=12x-2=±2√3x=2-2√3,x=2+2√3

设X为正数则：（X+2）-（3X+5）=1+X解得X=-4/3设X为负数则：（-X+2）-（-3X+5）=1+（-X）解得X=4/3

解方程：(x-2)(x^2-6x-9)=x(x-5)(x-3)将方程展开：X^3-6x^2-9x-2x^2+12x+18=x^3-8x^2+15x合并同类项得：12x=18则x=18/12=3/2