|x1-x2|
已知x1,x2(x1
若x1,x2(x1
设x1,x2(x1
定义区间[x1,x2](x1
定义:区间[x1,x2]( x1
X2/X1(X1+X2)+X3/(X1+X2)(X1+X2+X3)+.Xn/(x1+x2+...Xn-1)(X1+X2.
(x1+x2+...+xn)^2
min=2*x1+3*x2; x1+x2>=350; x1>=100; 2*x1+x2
已知x1,x2,...x2010均为正实数,求x1+x2/x1+x3/x1*x2+...+x2010/x1*x2*...
x1,x2,.x9是正整数,且x1
设x1,x2,...,xn为实数,证明:|x1+x2+...+xn|
二次函数中x1+x2=?,x1.x2=?