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英语数学题我晕For problems 1and 2 ,the supply and demand equations

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英语数学题我晕
For problems 1and 2 ,the supply and demand equations are given as follows :
S=2/3P-100    D=-4/3P+500   ,where P is the price
The equilibrium price is
A 200  B.300 C.600  D.900
2.  The number of items that wil be demanded at the equilibrium price is
A.500  B.300  C.200  D.100
 
 
 
 
正确：B D
 
主要不懂 ,where P is the price
求讲解  求详解 求算法  求 equilibrium price 平衡价格?的意思  
英语数学题我晕For problems 1and 2 ,the supply and demand equations
题目是供求的方程分别为S=..D=...
要求供求平衡,就是S=D,得出P=300
当为平衡价格时,需求量是D=-4/3P+500=100
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