大师作文网解方程 4x-3 6(3-4x) =7(4x-3)
来源：学生作业帮助网 编辑：作业帮 时间：2024/10/07 17:31:14
(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
(x+1)(x+3)+4x=-13x方+4x+3+4x+13=0x方+8x+16=0(x+4)方=0x1=x2=-4
将x-7/x-9分解成1+2/(x-9)其他分式同理则原方程等价于1/x-9+1/x-5=1/x-6+1/x-81/x-6-1/x-5=1/x-9-1/x-81/(x-5)(x-6)=1/(x-8)(
((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
4X+15-3X=17X=2
x(2x-4)+3x(x-1)=5x(x-3)+82x²-4x+3x²-3x=5x²-15x+88x=8x=1
x^2-2x-3=0(x-3)(x+1)=0x=3,x=-1
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
4x-3(20-x)=5x4x-60+3x=5x2x=60x=30
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
通分得[（x-8）(x-4)-(x-9)(x-3)]/(x-3)(x-4)=[(x+7)(x+3)-(x+2)(x+8)]/(x+8)(x+3)解得5/(x-3)(x-4)=5/(x+8)(x+3),
移项得2x+3x-4x=18合并同类项得X=18
(x+8)/(x-3)-(x-9)/(x-4)=(x+7)/(x+8)-(x+2)/(x+3)[（x-8）(x-4)-(x-9)(x-3)]/(x-3)(x-4)=[(x+7)(x+3)-(x+2)(
3x-20+4x=x+403x+4x-x=40+206x=60x=10
9x=90+4x9x-4x=905x=90x=18
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)+(
(x-3)^2+4x^2=36x²-6x+9+4x²-36=05x²-6x-27=0(5x+9)(x-3)=05x+9=0或x-3=0解得x=-9/5或x=3如还不明白,
（2x-3)(-2x-3)+9x=x（3-4x)－（2x－3）（2x＋3）＋9x＝3x－4x²－（4x²－9）＋9x＝3x－4x²－4x²＋9＋9x＝3x－4x
∵（36x^2＋84x＋49）（3x^2＋7x＋4）＝6,∴［（36x^2＋84x＋48）＋1］（3x^2＋7x＋4）＝6,∴［12（3x^2＋7x＋4）＋1］（3x^2＋7x＋4）＝6,∴12（3x
4x-60+3x=37x=63x=9