—2 ≤ 5x+1 < 2
解不等式组:2x+5≤3(x+2)x−1<23x
解不等式组:X-3(X-1)X≤7① 1-(2-5x)/3<x②
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4
|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10|
3≤|8-x| |x+1|>2-x |x+3|7|x+1| x^2-6|x|+9>0 |x-1|+|x+2|≥5
x-(3-1)≤x+2解不等式!x-5/2+1>x-3 3/1x-2<1-5/1x x-(3x-1)≤x+2
用区间法表示下列集合1 {x丨x≤5},2 .{x丨x-3},3.{x丨-1<x<7},4.{x丨x>5或x<0},
解下列不等式组(1){ 1+2x>3+x,5x≤4x-1(2){2-x≤-1 ,3<x-1
解不等式组:{3+x<4+2x,5x-3≤4x-1,7+2x>6+3x.
解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6)
(x/x-1)+(5x-2)/x*x-x=1 求x(有图)