x²x²-x<0x(x-1)<0当x>0时x-1<0x<10当x<0时x-1>0x>1(舍去)其实x就是纯小数或者纯分数比如0.2的平方是0.04,1/2的平方是1/4都符合x²
x平方<=xx平方-x<=0x(x-1)<=00<=x<=1
x²≤xx²-x≤0x(x-1)≤00≤x≤1