热火队喊的Let's go

解题思路：设投中了x个3分球，19-x个2分球，根据题意可得关系式：3分球得分+2分球得分+1分球得分=总得分，然后根据等量关系列方程：3x+2（19-x）+1×5=45；解答即可．

设投中了x个3分球，19-x个2分球，
3x+2（19-x）+1×5=45，
3x+38-2x+5=45，
3x-2x=2，
x=2；
答：詹姆期本场比赛投中了2个3分球．
故答案为：2．

点评：
本题考点： 列方程解含有两个未知数的应用题．

考点点评： 列方程解含有两个未知数的应用题，关键是需要找到两个关系式，根据其中一个设出未知数，根据另一个列方程．

2

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