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1.75亿学生的选择
某厂今年一月的总产量为100吨，三月的总产量为121吨，平均每月增长率是多少？
设平均每月增率是x，二月份的总产量为：100×（1+x）；三月份的总产量为：100（1+x）2=121；解得x1=-2.1（不合题意，舍去），x2=10%．答：平均每月的增长率是10%．
为您推荐：
根据增长后的量=增长前的量×（1+增长率），如果设平均每月增率是x，那么根据三月份的产量可以列出方程．
本题考点：
一元二次方程的应用．
考点点评：
此题主要考查了一元二次方程的应用，若设变化前的量为a，变化后的量为b，平均变化率为x，则经过两次变化后的数量关系为a（1±x）2=b（当增长时中间的“±”号选“+”，当降低时中间的“±”号选“-”）．
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