X/2 (900-X)=500怎么解？

x=1000(900-x) ,x<>900, <>表示不等号

若是 X/[2(900-X)] = 500, 则 X = 1000(900-X) ,
1001X = 900000, X = 900000/1001;
若是 (X/2)(900-X) = 500, 则 X(900-X) = 1000 ,
x^2-900x+1000, x = 450±5√41

x/2（900-x）＝500
x＝1000（900-x)
x＝900000-1000x
1001x＝900000
x≈899.1

依据题意列式计算如下：
x/2+（900-x）=500
x/2-x=500-900
x/2=400
x=800