解不等式,3x*2-7x 2 x*2-4x 1
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/19 08:50:39
![解不等式,3x*2-7x 2 x*2-4x 1](/uploads/image/f/7205949-45-9.jpg?t=%E8%A7%A3%E4%B8%8D%E7%AD%89%E5%BC%8F%2C3x%2A2-7x+2+x%2A2-4x+1)
3x-7>x的解集为x>7/2,2-5x2/7,【3x-7>x,2-5x7/2,不等式3x-7>x的解集与不等式组【3x-7>x,2-5xx的解集与不等式组【3x-7>x,2-5x
-3x+2>2x+7-3x-2x>7-2-5x>5x
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.
根据题意,对x分3种情况讨论:①当x≥12时,原不等式可化为x+3+2x-1≥7,解得x≥53,②当-3≤x<12时,原不等式可化为x+3+1-2x≥7,解得解得x≤-3,所以x=-3,③当x<-3&
2x/7-3/2>5x-6/14-33x/7>15/14x
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.
两边同时平方
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
3[x-2(x-7)]小于等于4x3(x-2x+14)≤4x-3x+42≤4x7x≥42x≥6
楼上的反了k=0的时候显然有解k+1
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
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
∵分式2−3x2x2+5的值是负数,2x2+5>0,∴2-3x<0.x>23,故答案为:x>23.
3x^2-7x
3x^2-7x