搜搜考试网3-1.2X=5分4-12
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你要求什么结果?A=｛x｜x²-5x-6≤0｝则A=｛x｜-1≤x≤6｝-----------------------------------------B=｛x｜(x+2)/(3-x)≥0
[(x+2)+1]/(x+2)-[(x+1)+1]/(x+1)=[(x+4)+1]/(x+4)-[(x+3)+1]/(x+3)1+1/(x+2)-1-1/(x+1)=1+1/(x+4)-1-1/(x+
5x(3x+2)=6x+45x(3x+2)=2（3x+2）5x(3x+2)-2（3x+2）=0(5x-2)(3x+2)=0x1=2/5x2=-2/3
17减百分之120x=585-6x=256x=60x=10x－百分之12x=2.8160.88x=2.816x=3.25分之4×4分之1－2分之1x=20分之14－10x=1x=3/10x＋9分之7x
3/4：x=1/8:6/51/8x=3/4×6/51/8x=9/10x=72/10
1/3x+3/4x=26/5解4/12x+9/12x=26/513/12x=26/5x=26/5÷13/12x=24/5
这个容易阿,将x=5带入整个方程,得出结果m等于3.满意请采纳
x-4=(x-4)^2,(x-4)^2-（x-4)=0,（x-4)(x-4-1)=0,x=4或x=5（5x-1)(2x+4)=3x+610x²+20x-2x-4-3x-6=010x²
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5x(x—3)=(x—3)(x+1)5x(x-3)-(x-3)(x+1)=0(x-3)(5x-x-1)=0(x-3)(4x-1)=0x=3或1/4x的平方—4x—12=0(x-6)(x+2)=0x=6
In[1]:=Factor[2x^7+x^6-11x^5-7x^4+12x^3+15x^2+9x-9]Out[1]=(-1+2x)(-3+x^2)^2(1+x+x^2)In[4]:=Factor[2x
原式=∫{x²+x+1+(x²+x-8)/[x(x²-1)]}dx=x³/3+x²/2+x+∫[8/x-3/(x-1)-4/(x+1)]dx=x&su
5x²-4x-1/4=x²+(3/4)x(5x²-x²)-(4-3/4)x-1/4=04x²-(13/4)x=1/416x²-13x=1x=
移项4x²-1=0(2x+1)(2x-1)=0x=-1/2,x=1/2
1.x-2=x(x-2)（x-2）（x-1）=0x=2或x=12.4x^2-169=0(2x+13)(2x-13)=0x=-13/2或x=13/23.（x-5）^2=2(5-x)（x-5）^2-2(5