1、同底数幂的乘法课前预习要点感知aman_(m,n都是正整数)即同底数幂相乘,底数_,指数_预习练习11下列各项中,两个幂是同底数幂的是( )Ax2与a2 B(a)5与a3C(xy)2与(yx)2 Dx2与x12(黔西南中考)计算:a2a3_当堂训练知识点1直接运用法则计算1计算:(1)aa9; (2)x3nx2n2;(3)()2()3; (4)(xy)3(xy)2.知识点2灵活运用法则计算2已知am2,an5,求amn的值课后作业3下列计算错误的是( ) A(a)(a)2a3 B(a)2(a)2a4 C(a)3(a)2a5 D(a)3(a)3a64式子a2m3不能写成( ) Aa2ma3 Ba
2、mam3 Ca2m3 Dam1am25若82332(2)82x,则x_6计算:(1)x2(x)4(x)3;(2)(mn)(nm)3(nm)4;(3)3x3x9x2x102xx3x8.挑战自我7已知(ab)a(ba)b(ab)5,且(ab)a4(ab)4b(ab)7,求aabb的值参考答案要点感知amn不变相加预习练习11D12a5当堂训练1(1)原式a19a10.(2)原式x3n2n2x5n2.(3)原式()23()5.(4)原式(xy)32(xy)5.2amnaman2510.课后作业3A4.C5.196.(1)原式x2x4(x3)x2x4x3x9.(2)原式(nm) (nm)3(nm)4(nm)134(nm)8.(3)原式3x12x122x122x12.挑战自我7(ab)a(ba)b(ab)5,(ab)a4(ab)4b(ab)7,解得aabb2233108.