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《探索平行线的判定方法》精品教案优质课下载
教学过程
幂的乘方
一﹑复习
1﹑学生叙述同底数幂的乘法运算法则,并用字母表示.
2﹑ EMBED Equation.DSMT4 = EMBED Equation.DSMT4 (m ﹑ n 都是正整数)
用语言叙述为:同底数幂相乘,底数不变,指数相加.
3﹑复习练习
(1) EMBED Equation.DSMT4 × EMBED Equation.DSMT4 =____ (2) EMBED Equation.DSMT4 × EMBED Equation.DSMT4 =_____
(3) EMBED Equation.DSMT4 × EMBED Equation.DSMT4 =____ (4) EMBED Equation.DSMT4 · EMBED Equation.DSMT4 · EMBED Equation.DSMT4 · EMBED Equation.DSMT4 =_____
二﹑知识准备
1、一个正方体的棱长是10cm,则它的体积是多少?
EMBED Equation.DSMT4 =10×10×10
2、一个正方体的棱长是 EMBED Equation.DSMT4 cm,则它的体积是多少?
3、100个 EMBED Equation.DSMT4 相乘怎么表示?又该怎么计算呢?
EMBED Equation.DSMT4 = EMBED Equation.DSMT4 × EMBED Equation.DSMT4 ×…× EMBED Equation.DSMT4 (100个 EMBED Equation.DSMT4 )
4﹑猜一猜
EMBED Equation.DSMT4 = EMBED Equation.DSMT4 · EMBED Equation.DSMT4 ··· EMBED Equation.DSMT4 (乘方的意义)
= EMBED Equation.DSMT4 (同底数幂的乘法法则)
= EMBED Equation.DSMT4 (乘法的意义)
三﹑新授
1﹑猜一猜
EMBED Equation.DSMT4 = EMBED Equation.DSMT4 (m,n为正整数)
推导:
EMBED Equation.DSMT4 = EMBED Equation.DSMT4 · EMBED Equation.DSMT4 … EMBED Equation.DSMT4 (n个 EMBED Equation.DSMT4 )
= EMBED Equation.DSMT4 (n个m)