-3x² 4x x²-5x 2x²-2的值 其他x=3分之1
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3−2(4x−1)≥5−4x①2x+93−2(x−3)<5②,解①得,x≤0,解②得,x>3,把解集画在数轴上为:不等式组无解.
(-x+2x平方+5)+(4x平方-3-6x)=-x+2x²+5+4x²-3-6x=6x²-7x+2
最后一个题设铅笔为X元,本子就是X+0.53(x+0.5)+2x=1.73x+1.5+2x=1.75x+1.5=1.7x=0.040.04+0.5=0.54元前面确实有点乱.
方程的两边同乘(2x-3)(2x+3),得2x(2x+3)-(2x-3)=(2x-3)(2x+3),解得x=-3.检验:把x=-3代入(2x-3)(2x+3)=27≠0.∴原方程的解为:x=-3.
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5x-1=4x5x-4x=1x=1
解题思路:本题主要依靠分式,将分母进行拆分,然后逐一消除,得到简便运算解题过程:1/1*2+2/1*2*3+3/1*2*3*4+……+6/1*2*…*10=1-1/2+(1/1*2-1/2*3)+(1
1.3x-2x0x>04.2x-7>5-2x4x>12x>35.1-3x/2>1-2x1/2x>0x>06.x-1/2(4x-1)x/43/4x>-1/2x>-2/3
2x2x+5−55x−2=1.2x(5x−2)(2x+5)(5x−2)−5(2x+5)(2x+5)(5x−2)=1,2x(5x−2)−5(2x+5)(2x+5)(5x−2)=1,10x2-14x-25
方程左边1/(xx+x)+1/(xx+3x+2)+1/(xx+5x+6)+1/(xx+7x+12)+1/(xx+9x+20)对分母因式分解得1/x(x+1)+1/(x+1)(x+2)+1/(x+2)(
分式有意义,则2x+1≠0,∴x≠-12.
x2x-1+x1-x=x2x-1-xx-1=x2-xx-1=x(x-1)x-1=x,故选:D.
x^2+2x+5=7所以x^2+2x=23x^2+6x+3=3(x^2+2x)+3=3*2+3=9再问:2怎么会变6?再答:3x^2+6x+3是题目给的x^2+2x=2是我根据题意化简得来的再问:??
(1)3x-2x2xx>0(4)2x-7>5-2x4x>12x>3(5)1-3x/2>1-2x1-3x>2-4xx>1(6)x-1/2(4x-1)=xx>=-2(8)0.01x-1再问:第八题的答案真
∵f(x)=1−3x2x+1=-32+52(2x+1),又∵52(2x+1)≠0,∴f(x)≠-32,则函数f(x)=1−3x2x+1的值域为(-∞,-32)∪(−32,+∞).故答案为:(-∞,-3
方程的两边同乘(2x+5)(2x-5),得2x(2x+5)-2(2x-5)=(2x+5)(2x-5),解得x=-356.检验:把x=-356代入(2x+5)(2x-5)=10009≠0.∴原方程的解为
x^2-25x=x(x-25)2x^2y^2-4y^3z=2y^2(x^2-2yz)am-an+ap=a(m-n+p)x^3-25x=x(x^2-25)=x(x+5)(x-5)1-4x^2=(1+2x
xx+yy+4x-6y+13=0整理得:(x+2)^2+(y-3)^2=0那么只有(x+2)=0(y-3)=0x=-2y=3(x^2-2x)/(x^2+3y^2)=(4+4)/(4+3*9)=8/31
∵分式2−3x2x2+5的值是负数,2x2+5>0,∴2-3x<0.x>23,故答案为:x>23.
3x2x+1不是等式呀?