1.(x+100)/240-x/280≥0.6 2.(1-5%)x≥1.5
1.x²-3x-18≤0 2.-x²+x≥3x+1
(1)3x/(x+2)>x+6;(2)x+1+5x^2/(x+2)≥1/(1-x);
1.分解因式:2x=3x-5 2.丨 1-x 丨≥5的解集 3.若x<0 丨x 丨=2 求x 4.A(x²-x
f x ={x(1-x)x≥0,x(1+x)x
3≤|8-x| |x+1|>2-x |x+3|7|x+1| x^2-6|x|+9>0 |x-1|+|x+2|≥5
函数f(x)=(x+1)lnx-x+1.证明:(x-1)f(x)≥0.
集合A={x|(5-x)(x+1)≥0}集合B={x|x平方-2x-m
1.试判断f(x)=2^x+2^-x的奇偶性2.解(x^2-2x-3)/(x+1)≥0
解下列方程..1.(x/x-5)=(x-2)/(x-3)2.(6x-1)/(3x+2)=(4x-7)/(2x-5)3.{
是关于因式分解的``1.计算x×x×x×x+5×x×x-6(x+y)(x+y+2xy)+(xy+1)(xy-1)2.已知
1x+2x+3x+4x+5x+6x+7x…+99x=100
解方程:2x+4x+6x...+100x=1-(x+3x+5x+...+99x)