方程3x² 4x=7中,b²-4ac= 方程的根为
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(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
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)(
symsxa=x^4+3*x^3+9*x-18b=x^5-4*x^3-18*x+7c=x^7+6*x^5+9*x^3-5*x^2-2d=x^9-8*x^7+6*x^5-4*x^4+6*x^2+3e=c
((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
A.3x-2=2x3x-2=2x则3x-2x-2=0(3-2)x-2=01x-2=0x-2=0x=2B.解4x-1=2x+3则4x-1-2x=34x-1-2x-3=04x-2x-1-3=0(4-2)x
(2x+3)(x-4)-(x+2)(x-b)=x²+62x²-8x+3x-12-(x²-bx+2x-2b)=x²+62x²-8x+3x-12-x
再问:2x是怎么得来的
1:方程3x²+4x=7中,b²-4ac=(4²-4×3×(-7)=100)方程的根为(-7/3或者1)2:方程(x-5)(x+2)化为一般形式是(x²-3x-
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),
(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)(
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)+(
此题中,b=-4,a=1,c=6,所以,b²-4ac=16-24=-8
(x-3)(x+8)=(x+4)(x-7)+2(x+5)x²+5x-24=x²-3x-28+2x+105x+3x-2x=24-28+106x=6x=1
(1/x-7)+(1/x-1)=(1/x-6)+(1/x-2)1/(X-7)-1/(X-6)=1/(X-2)-1/(X-1)(X-6-X+7)/[(X-7)(X-6)]=(X-1-X+2)/[(X-1
下列方程与方程5x-6=7x-10的解相同的是(D)
最后等于:分数线上面:23a+12b分数线下面:6不知道对不对
A.6X-3=6X+2无解B.-X=1-2/4+3/6-X=1X=-1C.-2X=-8-2X=-3D.2X-12X+9X=9+4+3X=-16所以本题无为0的解,
答案是C带入就可以得到了A带入后:-5=0错B带入后:2*15=9错C带入:2=2正确
你好选D由5x+1=3x-3移项得2x=-3-1即2x=-4解得x=-2.