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第1课时同底数幂的除法1【基础巩固】1.下列各式计算正确的是A.a+12=a2+1B.a2+a3=a5C.a8÷a2=a6D.3a2-2a2=12.am=3,an=2,则am-n的值是A.
1.5B.6C.9D.83.化简6a6÷3a3=_______.4.1
①195÷192=_______,
②-6÷-2=_______,
③-m8÷-m3=_______;2
①x9a÷x4a=_______,
②b2m÷bm-1=_______;3
①a-26÷2-a5=_______,
②-a-b5÷a+b=_______;4
①-mn9÷mn4=_______,
②a23÷-a22=_______.5.1若am+2÷a3=a5,则m=_______;2若ax=5,ay=3,则ay-x=_______.6.计算1x10÷x5.x3;2--66.-64÷-68;3a-b10÷b-a7;4xn+12÷x2n;5-xy7÷-xy4;6-2a6÷[-2a]3.【拓展提优】7.已知3x=a,3y=b,则32x-y等于 A.B.a2bC.2abD.a2+8.计算a23÷a22的结果是A.aB.a2C.a3D.a49.若3x=4,9y=7,则3x-2y的值为A.B.C.-3D.10.1
①-a3÷-a2=_______,
②a10÷a5÷a2=_______; 2
①xn+1÷x2n-3=_______,
②8m+1÷4m=_______11.1若32÷8n-1=2n,则n=_______;2若am=3,an=-2,则am+n=_______,am-n=_______.12.计算1-x3÷-x2;2-x2y35÷-x2y32;34×108÷8×105;4x10÷x4÷x2;5279÷97÷3;6-a7÷a3.-a2;7a43÷-a32.-a3;8x32÷x2.x3-2x3.-x52÷x23.13.已知3×9m×27m=321,求-m23÷m3.m2的值.14.1若xm=10,xn=-1,xk=2,求xm-2k+3n的值;2若3x=4,3y=6,求92x-y的值.参考答案【基础巩固】1.C2.A3.2a34.1
①193
②4
③-m52
①x5a
②bm+13
①2-a
②-a+b44
①-m5n5
②a25.1626.1x82-363b-a34x25-x3y36-8a3【拓展提优】7.A8.B9.A10.1
①a
②a72
①x4-n
②2m+311.122-6-
1.512.1x2-x6y935004x853126-a67-a98-x713.-414.1-
2.52PAGE1。