参考练习

(1)6x2÷(-2x)=_________.

(2)8x6y4z÷_______=4x2y2.

(3)( xy2-4x3y2)÷(-2xy2)=_______.

(4)(5a3b2+10a2b3)÷________=a+2b.

(5)()÷(3a2b3)=2a3b2-a2b+3.

(6)[6a2b2+________+________]÷________=3a+b-1.

2.选择题

(1)下列计算，结果正确的是()

A.8x6÷2x2=4x3B.10x6÷5x3= x3

C.(-2x2y2)3÷(-xy)3=-2x3y3D.(-xy2)2÷(-x2y)=-y3

(2)若xmyn÷ x3y=4x2则()

A.m=6，n=1B.m=5，n=1

C.m=5，n=0D.m=6，n=0

(3)计算正确的是()

A.(9x4y3-12x3y4)÷3x3y2=3xy-4xy2

B.(28a3-14a2+7a)÷7a=4a2-2a+7a

C.(-4a3+12a2b-7a3b2)÷(-4a2)=a-3b+ ab2

D.(25x2+15x2y-20x4)÷(-5x2)=-5-3xy+4x2

3.计算

(1)(102)3×104÷(-103)3.

(2)[(x+y)(x-y)-(x-y)2+2y(x-y)]÷4y.

答案：

1.(1)-3x(2)2x4y2z(3)- +2x2(4)5a2b2(5)6a5b5-3a4b4+9a2b3

(6)2ab3，-2ab2，2ab2

2.(1)D(2)B(3)C

3.(1)-10(2)x-y