【苏教版数学】步步高大一轮复习课件：2.4 指数与指数函数

星火益佰精品课件n n次方根次方根 根式根式 被开方数被开方数 根指数根指数a a的的a aa a1 1nmanmanma1nma10 0没有意义没有意义a ar rs sa ars rsa ar rb br rR(0(0，)(0,1)(0,1)y y1 1 00y y1 1 00y y1 1 1 增函数增函数 减函数减函数 32x25m43)(ba2 2 b b a a11d d c c7 7)65613()31216)(21322)(2(bababa653121612132ba.)()()()()(.)(.332332313432634250031321428232322867511aabbababaa.)()()()(110274232322213231621314141331,31,31nbma12x22x,0221222121221222222ktkttttt.)()(0122212222222212212ktttttkt12232ktt返回返回星火益佰精品课件x x轴轴零点零点f f(a a)f f(b b)0)1 1 1 12 2学生解答展示学生解答展示解：解：22|2|)(kxxxxxxf原方程有两个解时或当012210,04240122,22,20)1(kxkxkkkkkxkxkxxxxx时且当2222(2)0,2210440.10210(,1)(1,)xxkxxkxkxkkkkkxkxk 时当时两个当当或有解