— Yes, I do. And you can see they are made silk.
A:in; from
B:from; in
C:of; in
D:in; of
设x>y>z>0,若1x-y+1y-z+λz-x≥0恒成立,则λ的最大值是( )
不改变分式的值,下列分式的分子、分母中的系数都化为整数.
(1)2x+25y13x-y;
(2)0.5a-10.3a+2.